Leap Castle is an Irish castle in County Offaly, about 4 miles north of the town of Roscrea on the R421. It was built in 1250[citation needed]by the O'Bannon family and was originally called "Leim ui Bhanain," or "Leap of the O'Bannons." The O'Bannons were the "secondary chieftains" of the territory, and were subject to the ruling O'Carroll clan.
The Annals of the Four Masters record that the Earl of Kildare, Gerald Fitzgerald, tried unsuccessfully to seize the castle in 1513. Three years later, he attacked the castle again and managed to partially demolish it. But, by 1557 the O'Carrolls regained possession.
Following the death of Mulrooney O'Carroll in 1532, family struggles plagued the O'Carroll clan. A fierce rivalry for the leadership erupted within the family. The bitter fight for power turned brother against brother. One of the brothers was a priest. The O'Carroll priest was holding mass for a group of his family (in what is now called the "Bloody Chapel"). While he was chanting the holy rites, his rival brother burst into the chapel, plunged his sword into his brother and fatally wounded him. The butchered priest fell across the altar and died in front of his family.