19 May – Official beginning of the Irish War of Independence
23 May – Capture of Dublin, Grattan's Parliament moves to Belfast
2 June – Beginning of the Wexford Campaign
16 June – Battle of Galway, Irish victory
1 July-23 July – Siege of Limerick, ends with Irish victory
25 July – Battle of Wexford, end of Wexford Campaign with an Irish victory
3 August – Capture of Cork
27 September – 1st Battle of Derry, British victory
14 October – Battle of Drogheda, Decisive Irish victory
18 November – Battle of Sligo, Hiberno-French victory
12 December – Declaration of Independence of the Republic of Ireland Independence
3 February - 2nd Battle of Derry, Irish victory
23 February-2 March – Irish invasion of the Isle of Mann, ends with Siege of Douglas and the annexation of Mann in to the province of Ulster
4 April – Battle of Newry, Irish victory
19 May – On the anniversary of the beginning of the war, The Battle of Belfast takes place, with the British surrendering and the Irish gaining control of the whole of the island, and the capture of General Cornwallis
2 August – The USA and the French Republic, under Napoleon Bonaparte, recognise the independence of Ireland
30 September – Beginning of the General Cornwallis' trial for crimes against the people of Ireland
2 December – Cornwallis sentenced to death by hanging, with his execution the next day
28 March – Consulate elections, Wolfe Tone elected First Consul of Éire, beating Lazare Hoche.
4 November - Establishment of the Irish Bill of Rights, establishing the various freedoms and rights of the Irish People.
3 November – USA send 100 Shawnee Braves, at the request of the Irish Government, to train the army. 48 survive, and form the Connaught Indians Regiment of the Connaught brigade.
5 December – Irish pound reformed into Punt Éire, with one Punt (pound) equal to 100 Pingin (pence)
4 January – Russian Empire recognises Éire, becomes a major trading partner
18 May – Napoleon Bonaparte declares himself Emperor of France
17 October – Treaty of Douglas, official end to the Irish War of Independence
3 November – elections for the Constitutional Committee
16 October – Constitution of the Republic of Éire is ratified, with voters from territories won in the Treaty of Douglas voting one month beforehand. The main parts are the name of the country, the introduction of a federal state (the four traditional provinces, along with Dublin, would all become provinces of the federation, with an elected Assembly to decide all matters except defence and foreign affairs), the establishment of Tionól Chónaidhme na hÉireann (Federal Assembly of Éire), with Dáil Éireann as the lower house, with its members elected from single member constituencies with instant run-off voting, and Tionól cúige (Provincial Assembly) as the Upper house, with five members per province, regardless of size and population (this becomes important later in the history of Ireland, as the provinces of Nordheim and Iceland said that as the two biggest provinces, they should have more members in the Provincial Assembly). The Irish Bill of Rights was included as an integral part of the Constitution. The names of the governmental positions were also changed, with First Consul changes to Uachtaráin, Príomh Aire changes to Taoiseach, and all other titles that featured Consul, had it replaced with Aire, or Minister. Irish was made an official language of Éire, giving it equal footing with English.
1805 – 1815
Napoleonic Wars continue as OTL, except, as per the Treaty of Douglas, all Irish soldiers and officers, including Arthur Wellsley, Duke of Wellington and Field Marshal of the British Army, who served in the British Army were sent back to Ireland for integration into the Irish Army
Wolfe Tone resigns as Uachtaráin of Éire, having held the office for 15 years. The title passes to Arthur Wellesly, who remained Uachtaráin until 1826, when Daniel O'Connel was elected
26 December – Russian Decembrist revolt is successful in making Constantine Tsar of the Russian Empire, and within five years, Russia has transitioned from an absolute monarchy to a federal constitutional monarchy (not unlike Australia or Canada in OTL)
9 August – Louis-Phillipe d'Orléon becomes president of the Second French Republic, also known as the July Republic, after the abdication of Charles X.
27 June – Death of Constantine I of Russia. He is succeeded by Alexander II, who was remembered as the Peoples Emperor, especially in the Turkic regions.
Greece gains independence from the Ottoman Empire
Beginning of The First Abundancy in Ireland, where the economy is booming, and the country is beginning to foster trade links with the German States, Russia and even as far afield as Japan
The revolutions of 1848, with Louis-Pillipe being overthrown by a grandson of Napoleon I, leading to the establishment of the Second French Empire. Scotland and Wales declare independence from the Kingdom of Great Britain, just as their Irish brethren did 50 years previously. The Scots push the English out of Scotland entirely, and the Welsh go on to liberate Cornwall and south-west England, including the city of Bristol. The German Confederation unifies into the German Empire, with the Austrian Empire peacefully dissolving into the Kingdom of Austria (part of the German Empire), and the Hungarian Empire. The Italian states begin a proses of unification that would lead to the establishment of the Kingdom of Italy in 1855.
Publication of the Communist Manifesto, which would play a huge role int he 20th century
6 June – The Republic of Éire accepts Scotland, Wales and Cornwall as provinces, bringing the total to eight. The re-established Kingdom of England only accepets this if Ireland promises to have no more claims on English territory. The Republic of Éire was also renamed the Alliance of Celtia (Irish and Scots Gaelic:Comhghuaillíocht na Celtia, Welsh:Cynghrair y Celtia) signifying the unification of the insular celts.
1860 – 1865
Civil war in he USA, with the Deep South states seceding from the Union, mainly due to cultural differences. After the war, which resulted in a Union victory, the federal government in Washington decides to make the US a more centralised state, with the states becoming little more that OTL Soviet Republics
Confederation of Canada formed, with a union of the English colonies of Upper and Lower Canada, and the Irish territories of New Brunswick and Nova Scotia
1870 – 1871
German-French war, also known as the Alsace War. Due to the more advanced German army, the Germans quickly overrun most of Northern France, with Paris falling to the Germans by March 1871. The region of Alsace-Lorraine is given over to the Germans, and huge reparations are made.
Danish invasion of Sweden-Norway, under the pretext of uniting Scandinavia, under the control of Copenhagen. The governments in Stockholm and Krisitania ask Celtia for assistance. The Celtic government, under Uachtaráin William Shaw and Taoiseach Charles Parnell, agree to this, but only if all Scandinavian territories are annexed into Celtia. Sweden-Norway accepts, but only of the current king, Oscar II, can become the new King of Ireland. Celtia accepts this proposal.
25 March – Battle of Aaurus, end of the Danish war, and the admission of Sweden (capital - Stockholm), Norway (capital – Oslo/Krisitania), Denmark (capital - Copenhagen), Nordheim (northern Norway and Sweden OTL, capital - Trondheim) and Iceland (including Greenland, Foroyar and the Shetland Islands, previously part of Scotland, capital - Reykavik) as provinces of the new Kingdom of Ireland. Swedish, Norwegian, Danish and Icelandic are recognised as official languages of the new kingdom. The Danish royal family flees in exile, first to France, and then to Russia
1 June - Seán I, formerly Oscar II of Sweden-Norway, is crowned in King of Celtia, Sweden, Norway and Denmark in St. Patrick's Cathedral in Dublin.
former Uachtaráin William Shaw gives over the Phoenix Palace to Seán I to house the new Royal family.
10 November – birth of Pádraig Pearse, future Taoiseach
birth of William Foster, first leader of the USSA (United Socialist States of America).
13 March – Death of Alexander II of Russia. He is succeeded by Alexander III, who would further grow Russia's reputation as a land of the free buy creating more autonomous regions in the Empire, such as Kazakhstan and Georgia
Town of Dun Laoghaire in south Dublin is renamed Kingstun (Swedish for Kingstown), and the federal government encourages Swedish families to move there.
Year of three emperorrs in Germany, with Wilhelm I dying on 2 January, and Fredrich III dying on 15 June, leaving Wilhelm II to rule the German Empire for the next 50 years
The Quardruple Alliance between Germany, Hungary, Ireland and England comes into being
Death of Alexander III of Russia. Hhe is succeded by Nicolas I, more often known as Nicolas the Guardian, as during his reign, the full title of the Russian Tsars changed from Emperor and Autocrat of All Russians to Emperor and Guardian of All Russians
the French government severs all links with the church, becoming the last European country do do so.
Death of Queen Victoria of England. She was succeed by Edward VII
English Revolution and the begining of the Second Interregnum, results in the overthrowing of Edward VII, who flees to Canada, and quickly estalishes control over the southern African colonies, Australia, New Zealand and the Caribbean territories. The rest of the English colonies fall under the control of the Republic of England. The British Indian Empire declares independence as the Indian Union
Due to the stress of the exile to Canada, Edward VII dies in April. His son, George, takes the thrones of Canada, Australia, New Zealand and South Africa, not as George V, but as George I, signifying a new era of the English royal family.
The rest of the English colonies in southern Africa (that are controlled buy the monarchy-in-exile in Canada) are united with South Africa. Also united with South Africa are the Portuguese colonies of Angola and Mozambique and German South-West Africa
Seán I dies, leaving the Kingdom in mourning, especially in the Swedish areas of the kingdom, as he was originally king of Sweden. He is succeeded by Eoin Gustav I (OTL Gustav V of Sweden)
More to come