Prydain emerged from the collection of independent British-speaking kingdoms which arose following the end of Roman rule in the island. For a time their existence was threatened by Angle and Saxon attacks, but after the Battle of Loidis a period of relative peace arose known as the Ennarchy. Most of the north fell to Danish invasions during the late 9th century, but the surviving states fought back under the leadership of Dyfnaint and successfully reconquered the region during the 10th century. During this time Dyfnaint absorbed most of the British lands into itself and proclaimed the creation of the Kingdom of Prydain in 927.
In 1078 Prydain was conquered by King Hywel of Arvor, bringing it back into the continental sphere of events. Under Hywel's successors, the Jersiais dynasty, Prydain became the centre of a multinational empire which spanned both sides of the Gallic Channel and most of the Albic Isles. With the exception of Eriu, most of Prydain's overseas possessions in Europe were lost by 1605 when the Treaty of Lisbon was concluded, but by that time it had already begun exploring and colonising areas of the New World.