I just realized that Legalism can be several different free buildings. I always thought it was just monuments (didn't it used to be?)
I still hate its placement, though, if I'm going tradition early. A monument is very often the first thing I'll build in my capitol, or 2nd if I get a scout, so I have never liked picking Legalism so early and not receiving the free monument there (why doesn't it replace it with a free one like the CN tower does?) but I hate waiting so long to hit the opener without building that first monument, unless I find culture ruins. Bleh.