False Dmitry II
The Siege of the Troitsky monastery ("Троицкая осада", "Троицкое сидение" in Russian) was an abortive attempt of the Polish–Lithuanian irregular army that acted in support of False Dmitry II to capture the Trinity Monastery (the modern Trinity Lavra of St. Sergius) north of Moscow. The siege lasted for 16 months, from 23 September 1608 until 12 January 1610.