John I may refer to: People John I (bishop of Jerusalem) John Chrysostom (349 – c. 407), Patriarch of Constantinople John of Antioch (died 441) Pope John I, Pope from 523 to 526 John I (exarch) (died 615), Exarch of Ravenna John I of Naples (died c. 719) John of Abkhazia (ruled 878/879–880) John I of Gaeta (died c. 933) John I Tzimiskes (c. 925 – 976), Byzantine Emperor John I of Amalfi (died 1007) John I of Ponthieu (c. 1147 – 1191) John I (archbishop of Trier) (c. 1140-1212), Archbishop of Trier from 1190 to 1212 John of England (1166–1216), King of England, Lord of Ireland, Duke of Normandy and Aquitaine and Count of Anjou John I of Sweden (c. 1201 – 1222) John of Brienne (c. 1148 – 1237), king of Jerusalem John I of Trebizond (died 1238) John I of Dreux (1215–1249) John I of Avesnes (1218–1257), Count of Hainaut John of Brunswick, Duke of Lüneburg (c. 1242–1277) John I, Count of Blois (died 1280) John I, Duke of Saxony (1249–1285) John I of Cyprus (1259–1285) John I, Duke of Brittany (1217–1286) John I Doukas of Thessaly (1268–1289) John I, Prince of Anhalt-Bernburg (d. 1291) John I of Brienne, Count of Eu (died 1294) John I, Duke of Brabant (1253–1294) John I, Count of Holland (1284–1299) John I of Montferrat (c. 1275–1305) John of Scotland (c. 1249 – c. 1313) John I of France (1316), king for the five days he lived John I Orsini (1303/4–1317), Count of Cephalonia John I, Duke of Bavaria (1329–1340) John I of Bohemia (1296–1346) John I of Nassau-Weilburg (1309–1371) John I, Duke of Opava-Ratibor (c. 1322 – c. 1380–1382) John I, Duke of Mecklenburg-Stargard (1326–1392/93) John of Islay, Lord of the Isles (died 1386) John I, Duke of Lorraine (1346–1390) John I of Castile (1358–1390) John I, Count of La Marche (1344–1393) John I of Aragon (1350–1396) John I of Alençon (1385–1415) John, Duke of Berry (1340–1416) John the Fearless (1371-1419), ruler of the Burgundian State from 1404-1419 John I of Münsterberg (ca. 1380 – 1428) John I of Portugal (1357–1433), King of Portugal and of the Algarve, Lord of Ceuta John I, Duke of Bourbon (1381–1434) John I Albert of Poland, (1459–1501) João I of Kongo, ruler of the Kingdom of Kongo between 1470 and 1509 John of Denmark called Hans of Denmark, (1455–1513), King of Denmark, Norway and Sweden