Saint Andrei Rublev lived in the late 14th and early 15th centuries, and is celebrated as Russia's greatest iconographer. Not much is known about his life, so in this episode we will contemplate and discuss his most important icon: the icon of the Holy Trinity. This icon depicts the three angelic visitors that Abraham hosts in Genesis 18, but it really points to the true nature of the trinitarian God, Father, Son and Holy Spirit.