Ostrovskoye

The village later known as Ostrovskoye was called Semyonovskoye and formed part of the grand princes' estates in the Kostroma region. In his testament of 1353, Grand Prince Simeon mentioned Semyonovskoye alongside the neighboring estate of Alexandrovskoye, leaving them to his wife. The two properties were part of a broader concentration of princely landholding in the region. The village was also known as Semyonovskoye-Lapotnoye, a name associated with the local craft of weaving bast shoes.