Alexios IV Angelos (or Alexius IV Angelus) (Greek: Αλέξιος Δ' Άγγελος) (c. 1182 – February 8, 1204) was Byzantine Emperor from August 1203 to January 1204. He was the son of Emperor Isaac II Angelus and his first wife Irene. His paternal uncle was Emperor Alexius III Angelus.
The young Alexios was imprisoned in 1195 when Alexios III overthrew Isaac II in a coup. In 1201, two Pisan merchants were employed to smuggle Alexius out of Constantinople to the Holy Roman Empire, where he took refuge with his brother-in-law Philip of Swabia,King of Germany.
While there he met with Marquis Boniface of Montferrat, Philip's cousin, who had been chosen to lead the Fourth Crusade, but had temporarily left the Crusade during the siege of Zara to visit Philip. Boniface and Alexios discussed diverting the Crusade to Constantinople so that Alexios could be restored to his father's throne; in return, Alexios would give them 10,000 Byzantine soldiers to help fight in the Crusade, maintain 500 knights in the Holy Land, the service of the Byzantine navy (20 ships) in transporting the Crusader army to Egypt, as well as money to pay off the Crusaders' debt to the Republic of Venice with 200,000 silver marks. Additionally, he promised to bring the Greek Orthodox Church under the authority of the pope. Alexios accompanied Boniface back to the Crusader fleet, which had moved on to Corcyra, and the Venetians were in favour of the plan when they learned of it. In 1202 the fleet arrived at Constantinople. Alexios was paraded outside the walls, but the citizens were apathetic, as Alexios III, though a usurper and illegitimate in the eyes of the westerners, was an acceptable emperor for the Byzantine citizens.
Alexios I Komnenos, Latinized as Alexius I Comnenus (Greek: Ἀλέξιος Α' Κομνηνός, 1056 – 15 August 1118—note that some sources list his date of birth as 1048), was Byzantine emperor from 1081 to 1118, and although he was not the founder of the Komnenian dynasty, it was during his reign that the Komnenos family came to full power. The title 'Nobilissimus' was given to senior army commanders, the future emperor Alexios I Komnenos being the first to be thus honoured. Inheriting a collapsing empire and faced with constant warfare during his reign against both the Seljuq Turks in Asia Minor and the Normans in the western Balkans, Alexios was able to halt the Byzantine decline and begin the military, financial, and territorial recovery known as the Komnenian restoration. His appeals to Western Europe for help against the Turks were also the catalyst that triggered the Crusades.
Alexios was the son of Ioannis Komnenos and Anna Dalassena, and the nephew of Isaac I Komnenos (emperor 1057–1059). Alexios' father declined the throne on the abdication of Isaac, who was accordingly succeeded by four emperors of other families between 1059 and 1081. Under one of these emperors, Romanos IV Diogenes (1067–1071), Alexios served with distinction against the Seljuq Turks. Under Michael VII Doukas Parapinakes (1071–1078) and Nikephoros III Botaneiates (1078–1081), he was also employed, along with his elder brother Isaac, against rebels in Asia Minor, Thrace, and in Epirus.
Baldwin IV of Jerusalem (1161–16 March 1185), called the Leper or the Leprous, the son of Amalric I of Jerusalem and his first wife, Agnes of Courtenay, was king of Jerusalem from 1174 to 1185. His full sister was Queen Sibylla of Jerusalem and his nephew through this sister (who succeeded him) was the child-king Baldwin V. He had a half sister through his father's second marriage to Maria Comnena - Queen Isabella I of Jerusalem.
Baldwin spent his youth in his father's court in Jerusalem, having little contact with his mother, Agnes of Courtenay, Countess of Jaffa and Ascalon, and later Lady of Sidon, whom his father had been forced to divorce.[citation needed] Baldwin IV was educated by the historian William of Tyre (later Archbishop of Tyre and Chancellor of the kingdom), who made a disturbing discovery about the prince: he and his friends were playing one day, attempting to injure each other by driving their fingernails into each other's arms, but Baldwin felt no pain. William immediately recognized this as a sign of serious illness, but it was not conclusively identified as leprosy until a few years later; the onset of puberty accelerated his disease, in its most serious lepromatous form.