This map plots the settings and references in Dracula

To start exploring, click a red pin

Page 37. " after the battle of Mohacs "
by hector
There were two battles of Mohács, but Dracula is talking about the first, a victory for the Ottomans.  

Mohács is a town in Hungary, and the Ottoman triumph there in 1526 led to the centuries-long partition of Hungary between the Habsburg Empire, the Ottoman Empire and Transylvania.  For Hungarians, the battle is still seen as a national disaster.

The second battle of Mohács, in 1687, saw the Holy Roman Empire force the Ottomans out of Hungary.