In 1241, Alexander Nevsky came to Sarai, befriended and bebrothered Sartaq, become his sworn brother ("anda"), and an adopted son of Batu Khan.
Alexander Nevsky came to Sarai. This was in 1241. Sarai was befriended and bebrothered Sartaq. Sarai was become his sworn brother ("anda"). Sarai was become an adopted son of Batu Khan.