| Peter IV | |
|---|---|
 Peter IV, King of Aragon by Gonzalo Pérez & Jaume Mateu (1427) | |
| King of Aragon | |
| Reign | 24 January 1336 – 6 January 1387 |
| Coronation | 1336 (Zaragoza) |
| Predecessor | Alfonso IV |
| Successor | John I |
| Born | 5 September 1319 Balaguer, Principality of Catalonia |
| Died | 6 January 1387 (aged 67) Barcelona, Principality of Catalonia |
| Spouses | |
| Issue among others... | |
| House | Barcelona |
| Father | Alfonso IV of Aragon |
| Mother | Teresa d'Entença |
Peter IV[a] (Catalan: Pere IV d'Aragó; Aragonese; Pero IV d'Aragón; 5 September 1319 – 6 January 1387), called the Ceremonious (Catalan: El Cerimoniós; Aragonese: el Ceremonioso), was from 1336 until his death the king of Aragon, Sardinia-Corsica, and Valencia, and count of Barcelona. In 1344, he deposed James III of Majorca and made himself King of Majorca.
His reign was occupied with attempts to strengthen the crown against the Union of Aragon and other such devices of the nobility, with their near constant revolts, and with foreign wars, in Sardinia, Sicily, the Mezzogiorno, Greece, and the Balearics. His wars in Greece made him Duke of Athens and Neopatria in 1381.
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