Upvote:8
A little searching brought up a video walking tour of the museum room mentioned. This YouTube video on The Walking Camera channel shows what I assume is the bust in question [time 5:19], and the plaque beneath the bust labels the item as Ptolemy I, [time 5:30] , so it does start with a P and end with an I.
The label reads
Ptolemy I.
Egyptian, late 3rd century BC.Fragment of a basalt statue of Ptolemy I (305-283 BC), general of Alexander the Great, who founded the Ptolemaic dynasty of Egypt, wearing a royal headdress with a protecting serpent.
Said to have been found in the lining of a well in the Nile Delta.
The museum has more information concerning this particular statue here, and here is an image of the bust in question from Wikimedia