Tommaso d'Aquino, OP (1225 – 7 March 1274), also known as Saint Thomas Aquinas , is a Doctor of the Church. He was an Italian Dominican friar Roman Catholic priest, who was an immensely influential philosopher, theologian and jurist in the tradition of scholasticism, within which he is also known as the "Doctor Angelicus" and "Doctor Communis". The name "Aquinas" identifies his ancestral origins in the county of Aquino (in the present-day Lazio region), an area where his family held land until 1137.