Summary

Giorgio Vasari Lives of the Most Excellent Painters… (1850)

Gentile had been no long time in Constantinople before he portrayed the Emperor Mahomet from the life, and so exactly, that it was considered a miracle. Then the Sultan, after having seen many proofs of his ability in that art, desired to know if the painter had courage to take his own likeness? to which Gentile having replied that he had, many days had not elapsed before he had portrayed his own features, with the help of a mirror, so faithfully that the picture seemed to be alive.
Source: Wikisource

Giorgio Vasari Lives of the Most Excellent Painters… (1850)

Thus deprived of his brother Gentile, whom he had most tenderly loved, Giovanni, although very old, still continued to work a little, the better to pass his time, and having taken to execute portraits from the life, he introduced the custom into Venice, that whoever had attained to a certain degree of eminence should cause his likeness to be portrayed, either by himself or by some other master. Wherefore, in all Venetian houses, there are numerous portraits, and in many of those belonging to nobles, may be seen the fathers and grandfathers of the possessors, up to the fourth generation
Source: Wikisource

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