A horse!

If I had been a king
or
if I had a kingdom
or
If I had not been afraid of horses,
I had shouted:
"A horse, a horse, my kingdom for a horse!"
Because I was so tired, had so much pain in my feet after a walk in outskirts of town. And the suggestion for this far too long walk was mine. So stupid of me!
So, the girl could calmly ride on.

/The phrase is from Richard III by Shakespeare/