This happens a lot on Wikipedia (assuming your edits weren't vandalism and were reliable), it's called edit warring. Sometimes people get overprotective over articles they've been working on and won't let anyone else edit them. I had a similar experience like this on the Wikipedia article for Nero, where an editor continuously reverted my edits because he wanted to use the original Greek and Roman references instead of new published ones. I just gave up in the end.
You just have to stick to it, make sure all your references are solid and that your prose is good. If a problem arises, just get an admin invloved and if the person reverts your edits more than 3 times in 24 hours, HE can be blocked for violation of the 3 revert rule. I always tend to just create my own articles because then you don't really get anyone else bothering since you're creating it. Don't let it get to you - Wikipedia can be a horrible place sometimes, but it also does a lot of good.