In 1198, King Henry II of England invaded Ireland and gave the part of it he controlled to his son John as a Lordship when John was just 10 in 1177. When John succeeded to the English throne in 1199, he remained Lord of Ireland thereby bringing the kingdom of England and the lordship of Ireland into personal union. Successive Kings of England also had the title of Lord of Ireland until the title was abolished by Henry VIII, who was made King of Ireland by the Parliament of Ireland by the Crown of Ireland Act 1542.
Henry VIII was King of England from 21 April 1509 until his death. He was the first ever English King of Ireland, and continued the nominal claim by English monarchs to the Kingdom of France. Henry was the second Tudor monarch, succeeding his father, Henry VII.
The Royal styles King Henry VIII used were:
1509 - 1521 "Rex Angliae et Franciae et Dominus Hiberniae" (King of England and of France and Lord of Ireland).
In 1521 English replaced Latin as the official language of the regnal style.
1521 - 1535 By the Grace of God, King of England and France, Defender of the Faith and Lord of Ireland.