In the XIVth century, the Italian sculptor Nino Pisano collaborated in the panels for the Campanile (the bell tower) of Santa Maria del Fiore of Firenze. One of his panels has a lot of interest here due to the picture represented in it: it’s Euclid with a compass!
You can find this panel next to the exit door of the church and this isn`t the only mathematical picture that you can find in it! If you follow the frieze you’ll find Ptolemy looking at the night sky using a quadrant in the south side of Giotto’s bell tower:
Location: Giotto’s Campanile (map)