Prior Marbels Horse becomes someone elses horse after 3 game days, so when you mount it your bounty goes up.
I've been on Oblivion for more than 4 game months, Prior Marbel's Paint Horse is still mine...
Might be the patch though....
We forgot the duplication glitch.
There is also 1 that u can do with scroll's instead even after u hav installed the patch