This is the old mediaeval fort of Tighina Fortress, which was first built in the 15-16'th Centuries by the princes of Moldavia. Occupied by the Ottomans in 1538 (in a campaign lead by the Sultan Soliman the Magnificent), the fort was strenghtened in 1541 and became the center of an Ottoman "raya" (in which were included the surrounding Moldavian villages). Its walls and rounded towers still stand today.
Tighina Fortress was first mentioned as an important customs post in a commerce grant issued by Moldavian hospodar Alexandru cel Bun to merchants from Lvov on October 8 1408. The document is written in Old East Slavic and the place is named - Tyagyanakacha. The name Tighina is seen in documents since the second half of the 15th century.