The Danube Bulgar Khanate was a successor state of the Khanate of Great Bulgaria, taking what was left of the former Khanate's land which hadn't been absorbed by the Khazars. This minor state, which as its name suggests took residence in the areas around the Danube Valley, retained its uneasy independence until the early 8th century AD, when it was absorbed in to the Patzinak Empire as a tributary state. The Khanate maintained itself for another century, until, after a confused, Byzantine-subsidised independence attempt, it was permanently annexed to the Patzinak state.