He was the eldest son of Christopher Fleming, 12th Baron Slane and Eleanor, daughter of Patrick Barnewall: on his father's death in 1625 he succeeded as 13th Baron, but renounced the title in favour of his brother William, 14th Baron.
He was the eldest son of Christopher Fleming, 12th Baron Slane and Eleanor, daughter of Patrick Barnewall. He succeeded as 13th Baron. This was on his father's death in 1625. He renounced the title in favour of his brother William, 14th Baron. This was on his father's death in 1625.