>>/44493/
Subtle ways to do things.
> medieval times
> an income and house
Well this is basically nobility. You'd need to gain nobility.
You could pick a minor family and infiltrate them, ofc you need to appear as a man before people for practical reasons. Maybe you could pick some old dying noble without relatives and make him accept you as his son - you could make a deal, or trick him or something - and the situation could be presented that he thought you died when you were a kid or you are a bastard of his whom he made on a campaign or travel, etc. (in this case you'd need to be legalized or how that is called). This old noble can be a nobody, just with a house and a letter proving his nobility.
Then when it is accepted that you are his son, with the help of your magical powers doing low key tricks (liek telekinetically deflect lances of opponents during jousting or blinding your enemies in battle so you could defeat them), and with the help of your knowledge (for example mathematics), you could rise in prominence, winning the favor of higher nobility or the monarch.
Then you could trick people seeing you aging, then get some old bloke to play you and you could take the role of your son. Rinse, repeat.