Tallinn has historically consisted of three parts:

    * The Toompea (Domberg) or "Cathedral Hill", which was the seat of the central authority: first the Danish captains, then the komturs of the Teutonic Order, and Swedish and Russian governors. It was until 1877 a separate town (Dom zu Reval), the residence of the aristocracy; it is today the seat of the Estonian government and many embassies and residencies.
    * The Old Town, which is the old Hanseatic town, the "city of the citizens", was not administratively united with Cathedral Hill until the late 19th century. It was the centre of the medieval trade on which it grew prosperous.
    * The Estonian town forms a crescent to the south of the Old Town, where the Estonians came to settle. It was not until the mid-19th century that ethnic Estonians replaced the local Baltic Germans as the majority amongst the residents of Tallinn.

http://en.wikipedia.org/wiki/Tallin