Leonardo's Private Relationships

The Last Supper is for a particular church in Milan. So it's connected with that period of his work. Even when you are working for one court and based at one court, you might be taking on jobs for different clients in the same city. The drama chooses to portray also his personal life alongside his artistic and engineering work. What is known about Leonardo's private relationships? Well, this is a really, really challenging subject because the actual detailed evidence we have for Leonardo from his own lifetime is very, very scanty indeed.