This empire did not develop economically and instead worked to maintain military control over many different ethnicities. Rather than advances, this Empire maintained the status quo as Western Europe bcame much more advanced. , Took over Turkey from the Byzantine Empire and strived to expand its borders into Eastern Europe, mainly fighting the Holy Roman Empire and its various princes throughout the Middle Ages. Constanople the center. Over time it started to shrink and grow weaker, it was dismantled after WWI.