With the critical exception of John Palaiologos, the existence of other ancestors claimed by the later members of the Paleologus family can be verified through records at Pesaro.
John's supposed son, Theodore, and grandson, Prosper, have been proven to be real historical figures.
Prosper is documented as one of Pesaro's most prominent nobles in 1537 and is recorded as having been alive as late as 1580.
Both Theodore and Prosper served Pesaro's ruling family, the Della Rovere family, in a military capacity.
The records at Pesaro also prove the existence of a younger brother of Prosper, Guidobaldo Paleologus, who served as Capitan dei Porto in Pesaro, attested as such in 1578.

Prosper had three known sons; Camilio (of which next to nothing is known), Leonidas and Scipione.
In 1578, Leonidas and Scipione lived together with Camilio's young son, Theodore, and found themselves embroiled in a scandal as they were convicted for the attempted murder of Leone Ramusciatti, a man who was also originally of Greek descent.
Having failed to kill Leone, the three Paleologi had barricaded themselves in a church in an attempt to avoid arrest.
Documentation from Pesaro refer to the three as a something akin to a gang and allude to a previous (successful) murder conducted by them.
The fate of Scipione is unknown, but Leonidas was executed.
Theodore, who is referred to as a minor (he was probably 16–18 years old) was spared the death penalty and instead banished not only from Pesaro, but from the entire Duchy of Urbino.
With the critical exception of John Palaiologos, the existence of other ancestors claimed by the later members of the Paleologus family can be verified through records at Pesaro. John's supposed son, Theodore, and grandson, Prosper, have been proven to be real historical figures. Prosper is documented as one of Pesaro's most prominent nobles in 1537 and is recorded as having been alive as late as 1580. Both Theodore and Prosper served Pesaro's ruling family, the Della Rovere family, in a military capacity. The records at Pesaro also prove the existence of a younger brother of Prosper, Guidobaldo Paleologus, who served as Capitan dei Porto in Pesaro, attested as such in 1578.
Prosper had three known sons; Camilio (of which next to nothing is known), Leonidas and Scipione. In 1578, Leonidas and Scipione lived together with Camilio's young son, Theodore, and found themselves embroiled in a scandal as they were convicted for the attempted murder of Leone Ramusciatti, a man who was also originally of Greek descent. Having failed to kill Leone, the three Paleologi had barricaded themselves in a church in an attempt to avoid arrest. Documentation from Pesaro refer to the three as a something akin to a gang and allude to a previous (successful) murder conducted by them. The fate of Scipione is unknown, but Leonidas was executed. Theodore, who is referred to as a minor (he was probably 16–18 years old) was spared the death penalty and instead banished not only from Pesaro, but from the entire Duchy of Urbino.
Paleologus of Pesaro