Jakov Palaiologos - NOT a known son of Prince Constantin Palaiologos

cf -https://en.wikipedia.org/wiki/Constantine_Palaiologos_(Papal_Guard) (...-1508) [( ...-1543) Ita & Greek]

..Constantine died in obscurity[7] and he is not known to have had any children.[5]

Andreas' only son, Constantine Palaiologos, the last male heir of the Roman Imperial line traceable back to Julius Caesar, died in 1508 as a common soldier in Rome – a fitting end to fifteen centuries of Roman Imperators.[1]