In the 13th century, the was the largest land empire to that point in time.
a. roman empire
b. mongol empire
c. ottoman empire
d. byzantine empire

The Mongol Empire was the biggest coterminous land realm in world history. Established by Genghis Khan in 1206, it included most of the regions from southeast Asia to eastern Europe. The Mongol Empire risen up out of the unification of traveling tribes in the Mongol country under the administration of Genghis Khan, whom a board declared leader of the considerable number of Mongols in 1206.

In the 13th century, the MONGOL Empire was the largest land empire to taht point in time At its peak, Gengis Khan managed to lead Mongol's empire to almost all part of Asia and some part of northern Europe, which never could be achieved by any epire before