1258

Decades: 1200s 1210s 1220s 1230s 1240s - 1250s - 1260s 1270s 1280s 1290s 1300s

Years: 1253 1254 1255 1256 1257 - 1258 - 1259 1260 1261 1262 1263

• February 10 - Mongols overrun Baghdad, burning it to the ground and killing 10,000 citizens
• Llywelyn the Last declares himself Prince of Wales. He is the final ruler of an independent Wales, before its conquest by the English.
• John IV Lascaris succeeds his father Theodore II Lascaris as emperor of Nicaea. Due to his young age, he is appointed as regent Michael VIII Palaeologus.

• Osman I, founder of the Ottoman Empire

• Theodore II Lascaris, emperor of Nicaea

• Aragon - James I King of Aragon and count of Barcelona (reigned from 1213 to 1276)