I don't believe anyone can answer who the FIRST person to ride a horse was, but I DO know that horses where originally ridden somewhere in Central Asia in about 1600 B.C.
The first person to climb Ben Nevis was the botanist James Robertson in 1771.
Sir Alexander McKenzie was the first person to climb the rocky mountains
In 1913 Hudson Stuck was the first to climb Mount McKinley.
Italian Reinhold Messner was the first person to climb all 14 eight thousanders from 1970 to 1986. He was also the first person to climb Everest without the help of oxygen in 1978.
me
me
António de Saldanha was the first to climb Table Mountain in 1503
Edmund Hillary was the first person to climb to the summit of Mount Everest in 1953.
It is not known who was the very first to make an attempt to climb Mt Everest.
The first person to climb Mount Elbert was H. W. Stuckle in 1874
Chuck Norris
Mulla Hacen