Jahira-Tor, if your guild was ever one of the largest ones on its shard or went to war with another guild, you might try the Internet Archive site, using the URL for the page on uo.com that lists the top guilds for a particular shard. Unfortunately, it doesn't appear that you can use this method to find an archived copy of the page for a specific guild.
The Internet Archive site is at
http://www.archive.org/index.php .
As an example of a URL that should work in the Internet Archive's search engine, I tried looking for what it has as history for Baja's top guilds page (i.e.,
http://town.uo.com/guilds/shard_5.html ). The earliest page it found was from November 28, 1999. The dates for the other more recent pages that were archived seem very random.
Good luck and I hope this helps at least a little.