Franco Sacchetti recounts how after being commissioned to paint a shield with a coat of arms, this artist instead painted it "armed to the teeth." This artist depicted a donor holding the very triptych he was depicted in in one of the earliest examples of the Droste effect. By showing expressions in moments of action in paintings such as Saint Francis Receiving the Stigmata, this artist broke from the Byzantine style. This painter's version of the Lamentation is set on a hill with angels flying above and is on the north wall of a building which includes grisaille panels of the vices and virtues. This artist allegedly drew a perfect circle for Pope Benedict XI ("the eleventh") without the aid of a compass. This student of Cimabue painted the walls of a chapel in Padua commissioned by Enrico Scrovegni. For ten points, name this Proto-Renaissance painter who painted the Arena Chapel. ■END■