Medieval Lithuanian History – HIST1602 – Lecture Notes - Professor: Jonas Matas –1366 AD – 1386 - Class 20 – Legitimizing the Grand Duchy
Prior to inheriting the Grand Duchy, Dausprungas had a successful military career, having most recently helped defeat the Belarussian King. Despite his success in the battlefield many still doubted his ability to rule and maintain the independence of Lithuania.
Tarvydas, Dausprungas’s brother and the duke of Pruthenia, especially shows outright hostility to his brother’s rule.
In contrast, Dausprungas’s sister Jevna is supportive of her brother’s rule. As the bride of Duke Wojciech of Mazovia, her support has significant political weight in the region and results in the formalization of an alliance between the two.
In 1367 hoping to prevent a potential Belarussian resurgence, Dausprungas declares war for the Duchy of Polotsk. He asserts that his vassal Domawuj Suvalkija, Count of Vanemane as the true rule of Polotsk and declares King Zelibrat a usurper.
Dausprungas is supported by the Dukes of Mazovia and Smalond, while Zelibrat successfully convinces King Zygmunt Pomorza of Novgorod and the Grand Prince Gerden of Livonia to his cause.
Lithuanian forces cross over successfully into Polotsk and start sieging the holdings in Lukoml and Vitebsk.
Meanwhile the Belarussian coalition concentrates its attack from Estonia, but these forces are successfully repelled by the arrival of the Smalonder reinforcements.
By 1368 Lithuania has fully sieged Polotsk and Zelibrat is forced to surrender, ceding the lands of Belarus to Lithuania. Additionally, Zelibrat is required to surrender his crown and goes into exile in the neighboring Novgorod.
With the death of Giano Wigeriche of Croatia-Hungary in 1375, the large kingdom passes to his daughter Ambrosia Wigeriche, who had earlier inherited the Kingdom of Epirus from her maternal grandfather. This results in the incorporation of Epirus into the Wigeriche demesne, further fueling the regional tensions with Greece.
1377 indicates a change in Lithuanian attitudes to Rurikid Estonia, a longtime rival in the region. The marriage of the crown-prince Alexei Rurikid to Princess Roze results in a delicate but welcome peace between the two realms.
Despite successes in foreign policy, internal conflicts came to head in 1378 as Duke Kesgaila of Lithuania Proper reignites the Suvalkijan house conflicts. Kesgaila claims that under original agreement with Queen Danuta of Poland that established the Grand-Duchy of Lithuania, his house should be true rulers of Lithuania, not the Arunas’s descendants (commonly referred to as the House Suvalkija-Selpils).
In response, Dausprungas officially denounces Kesgaila and marks him as a traitor of the realm and sends his Marshal to Kernave to imprison the upstart duke.
Kesgaila’s forces apprehend Marshal and execute him, thus starting the Suvalkijan House war.
Luckily for Dausprungas, his forces far outnumber Kesgaila’s. Dausprungas personally intercepts Kesgaila’s forces en route to Raiseiniai and defeats them in the swamps of Veliuona.
Subsequently, Kernave is sieged and Kesgaila is forced to surrender.
The peace terms explicitly recognize the House of Suvalkija-Selpils as the true rulers of Lithuania. Kesgaila’s titles and lands are stripped and given to Prince Traidenis, Dausprungas’s younger son.
The Polish Kingdom expands its holdings in 1379 when King Zbigniew II inherits the Duchy of Sjaelland, and by 1384 he fully inherits the Kingdom of Denmark. Emboldened by his growing power Zbigniew launches a campaign into southern Lithuania, seeking to absorb border lands.
Much to the Zbigniew’s chagrin Duke Pawel of Mazovia, Dausprungas’s nephew, and longtime ally of Lithuania, pledges his support to Lithuania.
The first major battle of the war occurs on November 15, 1384 in Szrensk. Despite being outnumbered the Lithuanians are able to secure a victory, resulting in heavy Polish losses.
A second large battle happens in Weiksla close to the Barony of Gdansk, resulting in a Lithuanian victory.
These key battles allowed the Lithuanian coalition to siege most of the borderlands.
After another decisive battle in Szczetno, the Lithuanian side had secured a clear victory. Humiliated, Zbigniew II is forced to recognize Lithuanian sovereignty.
Lithuanian victory against the Polish Kingdom in 1386 legitimizes and enforces the role of the Grand Duchy in European politics.