Vakhtang Gorgasali was hunting.
His falcon was chasing a pheasant. The pheasant fell into something warm - a thermal spring, steaming quietly in the middle of a forest - and never came out. The king walked over and found the bird cooked. The water was boiling up from somewhere underground.
He looked at that place and understood something.
He called it Tbilisi. In Georgian, tbili means warm. The hot water was already there, rising from the earth. The city just grew around it.
That was the 5th century. More or less.
