Francis was born in 1558 in Cambridge, England, the eldest son of Richard Aungier, Esq., and Rose Steward. His father was a barrister and a member of Gray"s Inn. His father was murdered in his chambers in 1597, soon after his third election as Treasurer of Gray"s Inn, and his body thrown into the Thames: the brother of Francis, Richard Aungier, was hanged for the crime at Tyburn on 25 January 1598.
Francis attended Westminster School, and Trinity College, University of Cambridge, before entering Gray"s Inn in 1577.
In 1609, King James I appointed Aungier to the Irish Privy Council, as well as to the position of Master of the Rolls for Ireland. He was also knighted at Greenwich the King that same year. He was re-appointed Master of the Rolls for Ireland by King Charles I in 1625.
Aungier attended the House of Lords in 1614 and served as commissioner of the plantations at Munster in 1616 and Longford in 1620.
In 1619, he was appointed as a commissioner of the Great Seal following the death of Archbishop Thomas Jones. In 1621, he was created Lord Aungier, Baron of Longford by patent, which stated that he descended from the Counts of Aungier.
He purchased the lands of the White Friars Monastery where he resided in Dublin, where in 1677, Aungier Street was dedicated in his honor of family.
He became a member of several jurisdictions, and was the reader of the Inn in 1602.
