Sandalj Hranić Kosača was a medieval noble

Nobility

Nobility is a social class which possesses more acknowledged privileges or eminence than members of most other classes in a society, membership therein typically being hereditary. The privileges associated with nobility may constitute substantial advantages over or relative to non-nobles, or may be...

 from the House of Kosača

House of Kosaca

The House of Kosača was a medieval Bosnian noble family which ruled over various parts of Bosnia, Croatia and Dalmatia between the 14th century and the 15th century. The land they controlled was mostly known as Hum or Zahumlje...

. He ruled the area between Neretva

Neretva

Neretva is the largest river of the eastern part of the Adriatic basin. It has been harnessed and controlled to a large extent by four HE power-plants with large dams and their storage lakes, but it is still recognized for its natural beauty, diversity of its landscape and visual...

 and Drina

Drina

The Drina is a 346 kilometer long river, which forms most of the border between Bosnia and Herzegovina and Serbia. It is the longest tributary of the Sava River and the longest karst river in the Dinaric Alps which belongs to the Danube river watershed...

 rivers in Bosnia with the title Grand Duke

Grand Duke

The title grand duke is used in Western Europe and particularly in Germanic countries for provincial sovereigns. Grand duke is of a protocolary rank below a king but higher than a sovereign duke. Grand duke is also the usual and established translation of grand prince in languages which do not...

 of Hum

Zahumlje

Zachlumia or Zahumlje was a medieval principality located in modern-day regions of Herzegovina and southern Dalmatia...

between 1392 and his death in 1435.

As the head of the House of Kosača, Sandalj Hranić succeeded his uncle Vlatko Vuković

Vlatko Vukovic

Vlatko Vuković Kosača was a medieval nobleman who ruled as Grand Duke of Hum.He was a son of Vuk Kosača, the founder of the medieval house of Kosača. He governed the province of Hum, which was part of the Banate of Bosnia. The Ottoman threat was building to the east, threatening neighboring...

, and after 1419, he became the most powerful man in Bosnia. After he took part in the conspiracy to kill Pavle Radenović in 1415, Hranić came in conflict with Pavlović family. In fighting against them, he allied with Ottoman Empire

Ottoman Empire

The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

. He often had conflicts with King Stephen Tvrtko II of Bosnia

Tvrtko II of Bosnia

Stephen Tvrtko II reigned as King of Bosnia from 1404 to 1409 and again from 1421 to his death. His reigns took place during a very turbulent part of Bosnian history.-Family connections:...

, even refusing to attend his wedding to Dorothy Garai

Dorothy Garai

Dorothy Garai was Queen consort of Bosnia as spouse of King Tvrtko II of Bosnia.-Family and engagement:She was the daughter of powerful Hungarian nobleman, John Garai, who governed Croatia as ban, and a descendant of a notable Hungarian noble family of Garai. Dorothea's grandfather was Palatine...

 in 1428.

He was married three times, but had no children. After his death, he was succeeded by his nephew Stjepan Vukčić Kosača

Stjepan Vukcic Kosaca

Stjepan Vukčić Kosača was a Herzegovina nobleman. He was a member of the House of Kosača, a Grand Duke of Herzegovina, Lord of Zahumlje and Primorje and also Herzog of Serbian Saint Sava...

.