He was the son of David Crosbie, High Sheriff of Kerry, and his wife Jane Hamilton, and grandson of Sir Thomas Crosbie, also High Sheriff of Kerry. His father and grandfather both opposed the Glorious Revolution, and thereafter lived quietly on their County Kerry estates. Maurice"s election to the House of Commons in 1713 marked the family"s return to political prominence.
Trinity College.
His descendants became substantial landowners in Kerry: the senior branch were the Crosbie baronets, the last of whom, Sir Edward Crosbie, was executed for treason as a United Irishman in 1798. Maurice was educated at Trinity College in Dublin. He was knighted in approximately 1711.
He held the seat until 1758, when he was elevated to the peerage as Baron Brandon in the Peerage of Ireland, and assumed his seat in the Irish House of Lords.
They had seven children, including William Crosbie, 1st Earl of Glandore, and Maurice Crosbie, Dean of Limerick, father of the 4th and last Baron Brandon. He died circa 1762 and is buried in Ardfert.
In 1713 he was elected to the Irish House of Commons as the Member of Parliament for Kerry.
