I think this may be a smidge tenuous! Could 'ruler' mean 'capital'? Then how about 'Sophia' ?
(Extract from Wikipedia) -
Sofia (Ottoman rule)
"...After the campaign of Władysław III of Poland in 1443 towards Sofia, the city's Christian elite was annihilated and became the capital of the Ottoman province � of Rumelia for more than 4 centuries�"
Apologies if I've missed the point or it's a waste of time!