Old Testament Trinity: showing the Three Angels, each holding a staff seated at a table under the Mambra Tree in a rocky landscape and an architectural background, with the Angel in the centre representing Christ Pantocrator, on the left God the Father and on the right the Holy Gost.In 381 the 2nd Ecumenical Council made the Holy Trinity fundamental for religious philosophy.The above composition became predominant in Russian icon painting beginning with the 13th century and was made famous by Andrei Rublev’s Trinity painted about 1411 or 1420. Russian icon, late 17th century, (27½ x 24 cm).