| | - Peter I
- king of Serbia from 1903, the first strictly constitutional monarch of his country. In 1918 he became the first king of the Kingdom of Serbs, Croats, and Slovenes (later called ...
- Peter I
- king of Aragon from June 1094. The son of Sancho Ramirez, the third in order of the historic kings of Aragon, Peter belonged to times anterior to the authentic written ...
- Peter I
- king of Portugal from 1357 to 1367.
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