However, at that moment Muscovy was awfully weakened by tremendous losses suffered during the famous battle and thus in the same year Jogaila was free to begin a struggle for supremacy with Kęstutis.

Kęstutis and his son Vytautas entered Jogaila's encampment for negotiations but were tricked and imprisoned in the Kreva Castle, where Kęstutis was found dead, probably murdered, a week later.

When Grand Duke Gediminas finally settled in Vilnius, Senieji Trakai was inherited by his son the Duke Kęstutis.

The town was in the center of a conflict between Grand Duke Jogaila ( later to become King of Poland ) with his uncle Kęstutis.

In 1370 the wooden fort was destroyed by Lithuanians led by Kęstutis, after which it was rebuilt using stone.

Algirdas was the Grand Duke of Lithuania, and Kęstutis was primarily responsible for defense against the Teutonic Knights.

Kęstutis was ready to negotiate, but he and Vytautas were arrested and transported to Kreva Castle.

One week later, Kęstutis was found dead.

Jagiełło and Vytautas signed the Astrava Treaty in which Vytautas redeemed all Kęstutis ' lands, including Trakai, and was given more.

Born in 1350 in the castle of present-day Senieji Trakai, Vytautas was the son of Kęstutis and his second wife Birutė.

Kęstutis was the son of the Grand Duke Gediminas.

The agreement was approved with a pagan ritual by Kęstutis to convince the other side.

Kęstutis and Vytautas continued to recognize Jogaila's authority even when his right of inheritance was challenged by Andrei of Polotsk, Algirdas ' eldest son from the first marriage with Maria of Vitebsk.

It was the last treaty that Kęstutis and Jogaila signed jointly.

Some historians blamed Uliana, mother of Jogaila, or his adviser Vaidila, others pointed out generational differences: Kęstutis was about 80-years old and determined not to accept Christianity while Jogaila was about 30-years old and was looking for ways to convert and modernize the country.

Kęstutis became the Grand Duke while Jogaila was taken prisoner on his way back to Vilnius.

Jogaila pledged his loyalty to Kęstutis and was released.

On June 12, 1382, while Kęstutis was away to fight Dymitr Korybut of Novhorod-Siversky and Vytautas was away in Trakai, residents of Vilnius, led by merchant Hanul, let Jogaila's army into the city.

Kęstutis and his son Vytautas was captured and held prisoners in Kreva castle.

In 1382 Jogaila's and Kęstutis armies met near Trakai, but Jogaila tricked Kęstutis and imprisoned him in Kreva.

When Kęstutis discovered this in the following year, he seized Vilnius, imprisoned Jogaila, and made himself Grand Duke.

Vytautas and Kęstutis imprisoned by Jogaila.

Vytautas and Kęstutis imprisoned by Jogaila.

Kęstutis and his son Vytautas imprisoned in Kreva by Jogaila in 1382.

In 1382, Grand Duke of Lithuania Kęstutis was imprisoned here during the Lithuanian Civil War ( 1381 – 1384 ) and subsequently murdered on the order by his nephew Jogaila.

1300 – after 1366 ) was the Grand Duke of Lithuania from his father Gediminas ' death in 1341 until he was deposed by his elder brothers Algirdas and Kęstutis in 1345.

Some historians speculate that Kęstutis ' death after a week in prison was in fact assassination carried out by Skirgaila.

Kęstutis then resorted to take her by force, and with great pomp brought her back to his capital, Trakai, where he invited his kinsmen and celebrated with a lavish wedding ..." Kęstutis was later murdered and Birutė returned to Palanga and resumed serving at the shrine until her death.

However, Jogaila managed to escape and raised an army against Kęstutis, and his son Vytautas.

In the meantime Kęstutis rallied his supporters in Samogitia, his son Vytautas sought soldiers in Hrodna, and his brother Liubartas recruited in Galicia – Volhynia.

Vaidotas or Wojdat ( 14th century – after 1401 ) was a son of Kęstutis, Grand Duke of Lithuania.

Because of very limited historical sources, Vaidotas is sometimes confused with Vaidutis ( Waydutte ), son of Butautas and grandson of Kęstutis.

Butautas or Butaw ( baptized Henryk ; died on May 7, 1380 in Prague ) was a son of Kęstutis, Grand Duke of Lithuania.

Jogaila formulated the Treaty of Dubysa, which rewarded the Knights for their aid in defeating Kęstutis and Vytautas by promising Christianisation and granting them Samogitia west of the Dubysa river.

Vytautas ' father, Kęstutis, and his uncle Algirdas, were brothers and did not compete for power.

* House of Kęstutis – family tree of Vytautas

Kęstutis and Vytautas arrived to Jogaila's camp, but were arrested and sent to a prison in the Kreva Castle.

Born of the mightiest and highest resident family of the Grand Duchy of Lithuania ( as well as a blood descendant of King Casimir IV of Poland, and Kęstutis and Vytautas, monarchs of Lithuania ), Radziwiłł was the owner of Biržai, Dubingiai, Słuck, and Kopyta, the great Standard-bearer of Lithuania since 1638, the Master of the Stables of Lithuania since 1648, and the Starost barski.

Tautvilas or Towtwil ( c. 1352 – 1355 – September 1390 ) was one of the sons of Kęstutis, Grand Duke of Lithuania, and a strong supported of his brother Vytautas the Great in his struggles against their cousin Jogaila.

In 1382 Kęstutis died under suspicious circumstances, while Vytautas managed to escape and sought allies among the Teutonic Knights.

It is believed that dynastic disputes that soon erupted between him and his uncle Kęstutis and his cousin Vytautas the Great were largely inspired by Skirgaila.

Skirgaila was the chief supporter of his brother Jogaila and helped him to imprison both Kęstutis and Vytautas in Kreva castle during the Lithuanian Civil War ( 1381 – 1384 ).