Henry III (1551–1589)

King of France from 1574. He fought both the Huguenots (headed by his successor, Henry of Navarre) and the Catholic League (headed by the third Duke of Guise). Guise expelled Henry from Paris in 1588 but was assassinated. Henry allied with the Huguenots under Henry of Navarre to besiege the city, but was assassinated by a monk.

Henry III (1207–1272)

Just over a week after the death of his father, John, in October 1216, the nine-year-old Henry III was crowned king of England by Peter des Roches, bishop of Winchester. The regency council that ruled in his name effectively clung to power until 1234, when Henry was 27 years old.

King of England from 1216, when he succeeded John, but the royal powers were exercised by a regency until 1232, and by two French nobles, Peter des Roches and Peter des Rivaux, until the barons forced their expulsion in 1234, marking the start of Henry's personal rule. His financial commitments to the papacy and his foreign favourites antagonized the barons who issued the Provisions of Oxford in 1258, limiting the king's power. Henry's refusal to accept the provisions led to the second Barons' War in 1264, a revolt of nobles led by his brother-in-law Simon de Montfort. Henry was defeated at Lewes, Sussex, and imprisoned, but restored to the throne after the royalist victory at Evesham in 1265. He was succeeded by his son Edward I.

On his release Henry was weak and senile and his eldest son, Edward, took charge of the government.

Henry III (1379–1406)

King of Castile. He succeeded his father, John I, at the age of 11. Despite unrest during his regency period, he was able to assert his power and under his personal rule the kingdom prospered. He married in 1393 Catherine of Lancaster. During his reign the Canary Islands were taken by Castile.