Aikido was created by Morihei Ueshiba (植芝 盛平 Ueshiba Morihei, 14 December 1883 – 26 April 1969), referred to by some aikido practitioners as Ōsensei (“Great Teacher”). The term ‘aikido’ is a generic term coined in the twentieth century. Ueshiba envisioned aikido not only as the synthesis of his martial training, but as an expression of his personal philosophy of universal peace and reconciliation. During Ueshiba’s lifetime and continuing today, aikido has evolved from the Aiki that Ueshiba studied into a wide variety of expressions by martial artists throughout the world.
This information, and more about Aikido, can be found at the following Wikipedia link; http://en.wikipedia.org/wiki/Aikido