Neo-scholasticism is a revival and development of medieval scholasticism in Catholic theology and philosophy which began in the second half of the 19th century.
Thomas Aquinas
Thomism is the philosophical and theological school which arose as a legacy of the work and thought of Thomas Aquinas (1225–1274), the Dominican philosopher, theologian, and Doctor of the Church.
Thomas Aquinas (c. 1225–1274)
Summa Theologiæ, Pars secunda, prima pars. (copy by Peter Schöffer, 1471)
Triumph of St Thomas Aquinas, Benozzo Gozzoli,1471. Louvre, Paris