The first Russian written source which mentions them is the
Tolkovaya Paleya, from the 13th century. They are also mentioned in several later Russian chronicles from the period before the 16th century. This is in stark contrast to the related tribes
Merya and
Muroma, which appear to have been assimilated by the
East Slavs by the 10th and the 11th centuries.
Ivan II, prince of Moscow, wrote in his will, 1358, about the village Meshcherka, which he had bought from the native Meshcherian chieftain
Alexander Ukovich. The village appears to have been converted to the
Christian Orthodox faith and to have been a vassal of
Muscovy. Several documents mention the Meshchera concerning the
Kazan campaign by
Ivan the Terrible in the 16th century. These accounts concern a state of Meshchera (known under a tentative name of
Temnikov Meshchera, after its central town of
Temnikov) which had been assimilated by the
Mordvins and the
Tatars. Prince
A. M. Kurbsky wrote that a
Mordvin language was spoken in the lands of the Meshchera. The
Meshchera language is unattested, and theories on its affiliation remain speculative. In the
Oka River valley, the Meshchera culture appears to have disappeared by the 11th century. In the marshy north, they appear to have stayed and to have been converted into the
Orthodox faith. The Meshchera nobility appears to have been converted and assimilated by the 13th century, but the common Meshchera huntsman and fisherman may have kept elements of their language and beliefs for a longer period. In the 16th century, the St Nicholas monastery was founded in
Radovitsy in order to convert the remaining Meshchera pagans. The princely family
Mestchersky in Russia derives its nobility from having originally been native rulers of some of these Finnic tribes. == Archaeology ==