Peasant uprisings are not the issue. They have nothing to do with it.
Here is the article
http://be.wikipedia.org/wiki/Адміністрацыйны_падзел_Вялікага_Княства_Літоўскага
But i doubt you'll be able to read it.
I can summarize. In the beginning Lithuania was kinda a CKII country: many vassals united under the rule of the guy who set himself higher then others (to put it roughly). But this system was not suitable for a big country (Lithuania is already the biggest country in Europe not counting Horde lands). Vitaut (or Vitautas, as he most commonly known nowadays) annihilated this system. He removed the local dynasties from power in big principalities, reshaped the whole thing and split it into many smaller principalities. The 'big' dukes, if they cooperated, got some crappy city to rule over. Prince of Kiev got Drutsk. An insult, it would seem, but still. If they didn't they were destroyed. This was, in the full sense of it, the new administrative division. Many small principalities, all totally obedient and under the full control of Vilna. Kiev was one of several dozens. Later those where replaced by voivodships, when Lithuania adopted Polish administrative system.
Is it clear now? Every single province of Lithuania can become its own tag in 1444 by this kind of logics (not counting many dozens that aren't on the map).
Here is the article
http://be.wikipedia.org/wiki/Адміністрацыйны_падзел_Вялікага_Княства_Літоўскага
But i doubt you'll be able to read it.
I can summarize. In the beginning Lithuania was kinda a CKII country: many vassals united under the rule of the guy who set himself higher then others (to put it roughly). But this system was not suitable for a big country (Lithuania is already the biggest country in Europe not counting Horde lands). Vitaut (or Vitautas, as he most commonly known nowadays) annihilated this system. He removed the local dynasties from power in big principalities, reshaped the whole thing and split it into many smaller principalities. The 'big' dukes, if they cooperated, got some crappy city to rule over. Prince of Kiev got Drutsk. An insult, it would seem, but still. If they didn't they were destroyed. This was, in the full sense of it, the new administrative division. Many small principalities, all totally obedient and under the full control of Vilna. Kiev was one of several dozens. Later those where replaced by voivodships, when Lithuania adopted Polish administrative system.
Is it clear now? Every single province of Lithuania can become its own tag in 1444 by this kind of logics (not counting many dozens that aren't on the map).