Who created aikido?

This question is very complicated to answer because there is a philosophy side and the actual physical side to the art. Morihei Ueshiba created "Aikido" as we know it today. The concept "Aiki" has existed well before Ueshiba. Aiki is a pretty logical concept in the Martial Art World. Ueshiba was definatley a philosopher and he became very spiritual. Ueshiba has a few writings which could be ordered online or maybe a book store.
Morihei Ushibo created aikido, don't know if that's spelt right though, and instead of being called Sensei Ushibo we call O'Sensei