Of all the many lives of Michael Angelo that have been written, that by his friend and pupil, Ascanio Condivi, is the most valuable.

For not only is it a contemporary record, like the lives inserted by Giorgio Vasari in the two editions of his famous book, "The Lives of the Most Eminent Painters, Sculptors, and Architects," published in Florence in 1550 and 1568; but Condivi's work has almost the authority of an autobiography, many phrases are in the same words, as certain letters in the hand of Michael Angelo still in existence, especially those relating to the early life and the ancestry of the master, to his favourite nephew Lionardo, and concerning the whole story of the Tragedy of the Tomb to Francesco Fattucci and others.
Condivi's description of his master's personal appearance is so detailed that we can see him with his sculptor's callipers measuring the head of his dear master, and gazing earnestly into his eyes, recording the colours of their scintillations, with the patience of a painter.
Vasari's account has been translated more than once, but Condivi's never, at least never completely.

Extracts have been given, and it has been the main resource of every writer on the master; but the faithful and reverent character of the whole work can only be given in a complete translation, its transparent honesty, and its loving devotion.

Even had the subject of this naif and unscholarly narrative been an ordinary man in an ordinary period, it would have been worth translating for its truth to life and human nature, much more, therefore, when it is about the greatest craftsman of the Cinque Cento.
Condivi published his "Vita di Michael Angelo Buonarroti" on July 16, 1553; probably incited thereto by the master himself, who desired to correct certain misstatements of his excellent friend, Giorgio Vasari, without hurting that worthy's feelings.

Nevertheless, we gather from what Vasari says in his second edition that he somewhat resented the appearance of this new biographer.