Story of a benevolent king (or queen?) who disguises himself among peasants and then reveals himself or is revealed as king and then one of the peasants with whom he interacts thanks the king for the greatest gift a king could give: the gift of himself ('the gift of yourself'), better than gold or something and then this somehow relates to Christianity (perhaps the story came after as a reference to Jesus).
Any ideas please and thank you for the gift of yourself through time, effort, comments or answers? Merry Christmas, and happy holidays!