Question: What is the name of the palace built near the River Arno in Florence, Italy by the son of Buonaccorso Pitti?
Sentence (from "Buonaccorso Pitti"): In 1401, while serving as the Florentine ambassador to Bavaria, he, his brothers, and their descendants were ennobled by Rupert, King of Germany, after having saved his life by thwarting a poisoning attempt by the Duke of Milan.
Relevant evidence: No