Lorenzo Cabot discovered this artifact during an archaeological dig in the Rub' al Khali, or Empty Quarter, of Arabia in 1894. His guide protested its removal, believing it to have supernatural properties and afraid of any repercussions for its disturbance. Lorenzo secretly removed the artifact and returned with it to Boston.
When he put it on his head, the artifact fused to his nervous system, granting Lorenzo enhanced strength, resistances, localized telekinesis and immortality at the apparent cost of his sanity. Believing him to be a danger and unable to remove the artifact, his son Jack had Lorenzo and the artifact locked away below Parsons State Insane Asylum.
Lorenzo wears the crown in his cell below Parsons State Insane Asylum, but it is unobtainable without the use of console commands, but even then, it's not even visible to the player in item menus, and can only be spawned with the command player.placeatme 001467F5.
Targeting NPCs and even armor racks in the console will however allow the command equipitem 001467F5 to be used.
↑The Sole Survivor: "Where do you get this serum from?" Jack Cabot: "My father, Lorenzo Cabot, is... confined in Parsons. He became dangerously unstable after handling an artifact he found on an archaeological dig in Arabia. He gained various seemingly paranormal powers... as well as becoming increasingly irrational and violent. In the end, I had no choice but to confine him - for his own safety as well as ours." (Jack Cabot's dialogue)