From what I can tell its the second building requirement. I just had a quick scan through unitprod & it looks like the 2nd building requirement gives the valour ie futuwwa bowyer3 + swordsmith but you get 1 valour futuwwa's from a master swordsmith. I just had a quick look and any other unit that has 2 such building requirments the 2nd building req is the one that gives the valour in the campaign. If I get a chance i'll check it out today