Fra Angelico
In 1439, he finished one of his most famous works, which is the altarpiece for San Marco's Church, which is where the friars worship. It shows the Madonna and Child on a throne, surrounded by saints from different dates, who are all grouped together as if they were standing in a room in Heaven, talking about holy things. This type of painting called a "Sacred Conversation" later became very popular, but this is one of the first ones.