Transformation of the Ottoman Empire
Sultan Suleiman I (r. 1520–1566) was the longest-reigning sultan in Ottoman history, but the last years of his reign were characterized by uncertainty over who would be his successor. Suleiman had three sons who could hope to succeed, Mustafa, Bayezid, and Selim. While the latter two were the children of Suleiman's wife Hurrem Sultan, the first was the son of an earlier concubine. Mustafa may have felt that his half-brothers possessed an unfair advantage over him, and thus worked to secure the favor of the military. Perhaps suspecting that Mustafa planned to dethrone him just as his own father had done to his grandfather, Suleiman acted first and in 1553 ordered that Mustafa be executed. The death of Hurrem Sultan in 1558 triggered open conflict between the two remaining candidates, and Selim ultimately emerged victorious. Suleiman further strengthened his son's position by arranging a marriage between Selim's daughter and the influential Sokollu Mehmed Pasha (Grand Vizier 1565–1579). Suleiman died in 1566, while besieging the fortress of Szigetvar in Hungary, bringing Selim to the throne.
Mehmed V
Mehmed V. Reşâd (Ottoman Turkish: محمد خامس "Meḥmed-i ẖâmis", or ) (2 November 1844 – 3 July 1918) was the 35th and penultimate Ottoman Sultan. He was the son of Sultan Abdulmejid I. He was succeeded by his half-brother Mehmed VI. His nine-year reign was marked by the cession of the Empire's North African territories and the Dodecanese Islands, including Rhodes, in the Italo-Turkish War, the traumatic loss of almost all of the Empire's European territories west of Constantinople in the First Balkan War, and the entry of the Empire into World War I, which would ultimately lead to the end of the Ottoman Empire.