Briton Lara Prior-Palmer , 19 , is youngest winner of Mongol Derby . - American Devan Horn was the first rider to finish the race , but her horse failed a post-race medical inspection . The first female to win the race was American Jennifer Kricfalusi in 2005. Race takes inspiration from the Mongol Empire 's pioneering postal service . `` This is no guided tour , or pony trek , '' says race website .
Briton Lara Prior-Palmer , 19 , is youngest winner of Mongol Derby . - The first female to win the race was American Jennifer Kricfalusi in 2005. Race takes inspiration from the Mongol Empire 's pioneering postal service . `` This is no guided tour , or pony trek , '' says race website .