Don't forget the inscription on the Lapis Niger. It is the oldest known inscription in the Latin language dating from about 560 BCE:
quod hon … / … sakros es / ed sord …
… a has / recei : i … / …euam / quos : r …
…m : kalato / rem : ha … / … od : iouxment / a : kapia : dotau …
…m : i:te :r… / …m : quoi : ha / uelod : nequ … / …od : iouestod
…lou i(?) quiod …
Commentary from
http://sights.seindal.dk/sight/159_Lapi ... canal.html:
The first line declares the sanctity of the site (sakros esed). The second line mentions the king (recei — to the king), which given the early date of the inscription, must be the real kings of Rome, not the rex sacrorum of the early Republic. The third line mentions the king's herald (kalatorem — calator) and beasts of burden (iouxmenta — iumenta) are named.
It is likely that the sanctuary was used for sacrifices, maybe performed by the king, in connection with the meetings held in the Comitium (hence the herald).