Isker, the real Tatar name of the town of Sibir
Editorial contextMüller says Khan Makhmet moved the princely seat from the Tura to a high headland on the Irtysh and fortified it, because the old capital Chimgi (Tyumen), though protected by ravines, a rampart and ditches, lay on flat ground. The ruins could still be seen above Tobolsk. He rejects the idea that 'Sibir' is a Tatar word for 'capital': the Tatars call the fortress Isker, and the name Kashlyk used in the Tobolsk chronicle was, he says, used by no people he knew.
This place is the so-called old Tatar town and fortress of Sibir, whose remains can still be seen upriver of Tobolsk … The true Tatar name of this old fortress is Isker, by which name the Tatars call it to this day.
Working translation
Original wording
Сіе мѣсто есть такъ именуемое старинной Татарской городъ и крѣпость Сибирь, котораго остатки повыше Тобольска … еще и теперь видны. … Подлинное Татарское имя сей старинной крѣпости есть Искеръ, которымъ именемъ Татаре еще и понынѣ оную называютъ.
About Siberian Tatars (khans of the Taibugid line)
Keep in mind
The distance from Tobolsk is garbled in the OCR and has been left out.