The SI unit of inductance, equal to an electromotive force of one volt in a closed circuit with a uniform rate of change of current of one ampere per second.
Late 19th century named after Joseph Henry (1797–1878), the American physicist who discovered the phenomenon.
1The name of eight kings of England.
- 1.1Henry I (1068–1135), youngest son of William I; reigned 1100–35. He conquered Normandy in 1105.
- 1.2Henry II (1133–89), son of Matilda; reigned 1154–89. The first Plantagenet king, he restored order and extended his kingdom.
- 1.3Henry III (1207–72), son of John; reigned 1216–72.
- 1.4Henry IV (1367–1413), son of John of Gaunt; reigned 1399–1413; known as Henry Bolingbroke. He overthrew Richard II, establishing the Lancastrian dynasty.
- 1.5Henry V (1387–1422), son of Henry IV, reigned 1413–22. He renewed the Hundred Years War soon after coming to the throne and defeated the French at Agincourt in 1415.
- 1.6Henry VI (1421–71), son of Henry V; reigned 1422–61 and 1470–71.
- 1.7Henry VII (1457–1509), the first Tudor king; son of Edmund Tudor, Earl of Richmond; reigned 1485–1509; known as Henry Tudor. He defeated Richard III at Bosworth Field and eventually established an unchallenged Tudor dynasty.
- 1.8Henry VIII (1491–1547), son of Henry VII; reigned 1509–47. Henry had six wives (Catherine of Aragon, Anne Boleyn, Jane Seymour, Anne of Cleves, Catherine Howard, Katherine Parr ) and three children (Mary I, with Catherine of Aragon; Elizabeth I, with Anne Boleyn; and Edward VI, with Jane Seymour). His first divorce, from Catherine of Aragon, was opposed by the Pope, leading to England's break with the Roman Catholic Church.
(1394–1460), Portuguese prince; known as Henry the Navigator. The third son of John I of Portugal, he organized many voyages of exploration, most notably south along the African coast, thus laying the foundation for Portuguese imperial expansion around Africa to East Asia.
1The name of seven kings of the Germans, six of whom were also Holy Roman emperors.
- 1.1Henry I (c.876–936), reigned 919–936; known as Henry the Fowler. He waged war successfully against the Slavs in Brandenburg, the Magyars, and the Danes.
- 1.2Henry II (973–1024), reigned 1002–24, Holy Roman Emperor 1014–24; also known as Saint Henry.
- 1.3Henry III (1017–56), reigned 1039–56, Holy Roman emperor 1046–56. He brought stability and prosperity to the empire, defeating the Czechs and fixing the frontier between Austria and Hungary.
- 1.4Henry IV (1050–1106), son of Henry III; reigned 1056–1105; Holy Roman Emperor 1084–1105. Increasing conflict with Pope Gregory VII led Henry to call a council in 1076 to depose the Pope, who excommunicated Henry.
- 1.5Henry V (1086–1125), reigned 1099–1125, Holy Roman emperor 1111–25.
- 1.6Henry VI (1165–97), reigned 1169–97; Holy Roman Emperor 1191–97.
- 1.7Henry VII (c.1269/74–1313), reigned 1308–13; Holy Roman Emperor 1312–13.