This is a list of the Lord Protectors. These are the Heads of State of the Commonwealth of England. This position was created in 1653 after the 'Instrument of Government' was enacted leading to the creation of the Commonwealth. The Lord Protector holds his position for life and can choose his successor, though he doesn't hold absolute power and the Parliament holds more power (as in OTL now with the PM and government.)
Also with the Lord Protector there has generally been a Premier since Benjamin Disraeli created the position, the Premier is the Head of Government though holds extremely limited power himself.