I don't see how you can't find it in somepage.com, wasn't that hard at all.
http://ffxi.somepage.com/questdb/353
But of course, when it comes to more in depth on where to go, what to do and stuff, somepage.com lacks a lot. You can always try Allakhazam.com. I like that site a lot in that people can make comment on the quest sharing information on their experience in doing the quest.
http://ffxi.allakhazam.com/db/quests...lm=&fquest=250
Then again, besides those two, there is always the lovely MysteryTour. I know its English isn't the best, but you gotta know that the site is originally Japanese and the webmaster was kind enough to translate everything for the English players. MysteryTour covers a lot of things too and its tables make lists and lists of various things easy to look at.
http://mysterytour.web.infoseek.co.j...t0/005q-af.htm
However, if you're still lazy to click on the links yourself, here is a short summary of what you need to do for the samurai's artifact weapon quest.
First and foremost, have you saved your mumeito great katana that you get from when you first got your samurai flag? If you somehow tossed it away you can always go back to Jaucribaix, the NPC for the SAM flag quest and also AF1 quest, pay a certain amount of gil and get it back. I think the amount was 30,000 gil and you can only get it back after you accepted the quest. Of course, if you didn't toss it away, you don't need to pay Jaucribaix to get another one.
Anyway, Jaucribaix will ask you for some scales. In order to get the scales you will need a sack of fishbait which can be dropped from Goblin Robbers in the Sanctuary of Zi'Tah. After you get the fishbait, you will have to go to E-8 near a lake in Zi'Tah and trade to a ??? to spawn a pugil NM. Upon killing the pugil, you can examine the ??? again for the scales you need for the quest. When you have the scales, just go back to Jaucribaix and trade him the mumeito great katana and you'll be done.