Sigwald slab from the baptismal font of Callistus. It is decorated with the four Evangelists' symbols each within a clipeo on the sides. The central field is divided in two parts. Upper part: a cross with braid decoration, flanked by two candle holders, two rosettes and two palms. Lower part: stylized tree (Tree of Life) with two branches ending in a lion's head. On the sides of the tree, there are two griffins and two birds holding up bunches of grapes. A Latin inscription runs in the middle band that divides the two parts.