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.
Buonaccorso's descendants, the Counts Buonacorsi di Pistoia,[1] moved from Tuscany to Bavaria in the late 19th century.
Hence, because with regard given to the constancy of loyalty and to the useful services of sincere fidelity, which you, Bonacorsi, have faithfully shown to us and to the Holy Empire, you and your brothers inscribed above ought to show to us something else.
Wherefore, we graciously admit you and anyone of your family into our friendship, and we add you to the community of our friends, with firm acknowledgement, recognizing that you enjoy and rejoice in all individual privileges, prerogatives, favors, and liberties wherever you wish, which our other friends enjoy however they wish, forever, in all things, et that in all your individual dealings and those dealings incumbent upon you, you implore the royal crown under full faith.
We also grant this special favor of our royal munificence of majesty mentioned above by royal authority for the present, both to you and to anyone of your family, and to those legitimately descended from you, that you and anyone of your family ought freely to carry and wear for the performance of military display in wars, tournaments, and whatever other military acts everywhere, a coat of arms depicted with respect to its circumference and colors accordingly in the handiwork of the painter, with special figures in its images, with any impediment thoroughly removed, with the arms of any others always preserved.