Aylmer of Balrath Barnewall of Crickstown Barnewall of Trimlestown

The Aylmers probably came to Ireland with the Norman conquerors and in the early 15th century rose to prominence after Richard Aylmer became the Keeper of the Peace for Dublin and Kildare during the reign of Henry VI. Their lot improved significantly when John Aylmer married an heiress at the close of the 15th century and thereby acquired the Lyons Estate. Sir Gerald Aylmer was Chief Justice of Ireland in the mid 16th century. (Anthony) Julian Aylmer, 14th Baron Aylmer (born 1951) is the current holder of the title. He lives in Canada.
The Barnewalls came to Ireland hot on the heels of the Norman invaders. The first men to come were Hugo and Reginald de Berneval who were granted lands in Dublin in the Drimnagh, Kimmage, Ballyfermot and Terenure areas where the families were settled until Cromwellian times. Crickstown Castle was built by Sir Patrick Barnewall the 1st Baronet (d.1624) of Crickstown who was granted that title in 1622.
Robert the second son of Sir Christopher Barnewall received estates in the Trim area and in 1461 was created the 1st Baron Trimlestown.
The present Baron Trimlestown Raymond Charles Barnewall, 21st Baron Trimlestown (born 1930) lives in Australia.