For me it was Custodis of Zion (Linenoise)
What was your first faction?
6 posts · 2006-10-06 19:21:00 to 2006-11-20 03:18:00
The Purged, Linenoise. Day 1 merv faction for a day 1 player!
The Tetragrammaton. I joined back in February, shortly after I started playing MxO again (if you even want to count the last week of the beta as playing to begin with, heh). It took a bit of effort to convince myself to join a faction at all. I thought I was pretty much burnt out on factions/guilds from other games, but I am glad I finally gave it another chance. The occasional unpleasant moments have certainly been worth the good friends I have found. 
The Company, Algorithm-->Proxy-->Syntax. I don't know if we exist at the moment, but if we do, I'm still in it! 
Holy Warriors of Zion-Zion-Recession
The Truce-Zion-Recession (had like 25 to 35 crews)
After the merge
Zion's United
Clan Zephyr-Zion
My first one was The french connection, after 5 days i left another one that i've forgetten the name and few days lata i went in the merv way for Les Affranchis