The grass on the hill was poisonous. Everybody except the bird dies. Whoever-currently-rules-Propoer's hill.
I was wearing shoes so I don't die. I plant an oak tree on the hill where the bird comes to perch. My Hill.
Perching is relaxing and fun, you should try it someday, just sit on a high branch on top of a hill, and stare into the sunset
The oak turn into a mighty ent who then plants Rohen head down into the ground and uses nature magic to grow the most twisted tree every. Bird's Hill
Propoer is now a necrocracy and declares me as it's eternal king. The country is ruled by a prince, but officially I'm the only ruler od Propoer. My hill.
Rohen died of a mysterious disease caused by being resurrected. Wearing a full body suit to protect from all diseases, I claim the (monarchy) necrocracy throne and declare myself the Tyrant ruler of Propoer. Anything inside the boundaries is now under my domain/control, which includes the hill. My Hill.
I was never resurrected on the first place. You take the place of the prince of Propoer, but I'm still the eternal ruler of Propoer as it's a necrocracy (the official ruler is dead, the country is ruled by some other leader), so... Still my hill (kind of).
Meanwhile my Infinite Empire is nearly completed expanding through its home universe, and makes the important discovery of other universes (of course I already knew but now it's official and public) and forms an alliance with the infinite empires from other universes. They form the alliance of Logi something similar to the citadel of ricks from rick and morty except with all equal and not insane participants. Each Logi is in charge of their own universe and can request help from the other Logis if they need it (although it rarely happens) But they also travel to universes with suitably advanced Logis and invite them to the alliance. All of the sudden a man in Infinity armor appears and invites me to re-join the multiverseal empire. I accept, and my infinite empire is remade in this universe. I sit down in my palace and look down on small the small monarchyical country of propoer, built around a hill, with its single necromancer prince who couldn't be bothered to necromancer himself back to life and I say... "Anyone want some tea and crumpets?" To Nobody in particular. Still Your Hill I guess