The modern village of Glassy, originated on the site of an ancient settlement of Ingermanland Finns — Maaselkä[5]. It was mentioned in the Scribe Book of the Vodskaya Pyatina of 1500 as the Maselga locality near Lake Silande, on which several villages were located, including two villages of Maselga[6].
In different years, the name of this settlement was written on maps as: Maaselka, Maselka, Maa-Selka, Maselka, Masalki, Masilka, Mazelki, Makselki and Maselki.
The first cartographic mention is the village of Mahsilka on the map of the Noteburg Lena of the first third of the XVII century[7].
Then, under the same name, it is mentioned on the map of Ingermanland in 1676[8].
On the map of the St. Petersburg province of Ya. F. Schmit in 1770, its name changes to Masalki[9].
And in 1834, on the map of the St. Petersburg province of F. F. Shubert, west of the village of Maa-Selka[10], the manor of Rozalvin landowner Krylov, a Glass Factory was first mentioned (it is also marked on a Special map of the Western part of Russia by F. F. Shubert 1826-1840[11]).
In the XIX century, both settlements of Maa-Selka and the Glass Factory belonged to the manor of Rozalvina of the Korkomyak parish.
At the same time, there was another settlement, which was called at different times: Makselka, Maselka, Mazelki, but it was located to the south and belonged to Elizabeth Kaidanova, a real state councilor and owner of a paper mill.
To the west and adjacent to the Glass Factory was the Glass Factory border crossing point between the Petersburg province and the Grand Duchy of Finland [12].
MASELKI is a village, the manor of Rozalvina, belongs to Timofey Krylov, state councilor, residents of 46 m. p., 54 w. p.;
ROZALVINA is a manor, owned by Timofey Krylov, state councilor, residents of 6 m. p., 7 w. p.;
With it: A glass factory. Small-vessel glass factory. (1838)[13]
On the ethnographic map of St. Petersburg province by P. I. Köppen in 1849, it is mentioned as the village of Maanselki, inhabited by Ingermanlanders-Evremeis[14].
In the explanatory text to the ethnographic map, the village is named Maanselki (Manselki) and the number of its inhabitants for 1848 is indicated: Ingermanlanders-Evremeis — 93 m. p., 107 w. p., as well as Finns-Suomi — 40 m. p., 44 w. p., a total of 284 people [15].
