The Treaty of Trentschin transferred suzerainty over Silesia from Poland to Bohemia, incorporating the region into the Holy Roman Empire.
Key Facts
- Date signed
- 24 August 1335
- Signing location
- Trentschin Castle, Kingdom of Hungary
- Territory transferred
- Duchies of Silesia (former Polish province)
- Mediator
- King Charles I of Hungary
- Follow-up event
- First Congress of Visegrad, later in 1335
Location
Cause → Event → Consequence
Competing claims over the former Polish province of Silesia created tension between the Kingdom of Poland and the Kingdom of Bohemia. King Charles I of Hungary, brother-in-law to Casimir III, acted as intermediary to broker a resolution between the two crowns.
On 24 August 1335, King Casimir III of Poland and King John of Bohemia, together with his son Margrave Charles IV, concluded the Treaty of Trentschin at Trentschin Castle in the Kingdom of Hungary, formally initiating the transfer of suzerainty over Silesia to Bohemia.
The Duchies of Silesia were incorporated into the Bohemian Crown and thus became part of the Holy Roman Empire. The three kingdoms of Bohemia, Hungary, and Poland subsequently convened at the First Congress of Visegrad in 1335, where the treaty was made official and further territorial divisions were discussed.
Political Outcome
Suzerainty over Silesia transferred from Poland to Bohemia; Duchies of Silesia incorporated into the Bohemian Crown and the Holy Roman Empire.
Poland held suzerainty over Silesia
Bohemia held suzerainty over Silesia as part of the Holy Roman Empire