Assertion: duchess's brother | /r/HasProperty | guidobaldo da montefeltro
Facets:
Source sentences:
text: On a diplomatic mission to Rome, Castiglione met Francesco Gonzaga's brother-in-law, Guidobaldo da Montefeltro, Duke of Urbino, husband of Francesco's sister Elizabetta Gonzaga; and in 1504, a reluctant Francesco allowed Castiglione to leave and take up residence in that court.