Then do as they do, I guess.
what is summus?
sumus -> 'we are' : first person plural of sum, esse ('to be').
summus -> adjective: highest, on top
Sumus = We are
The conjugated verb of "to be" for "we".
In Spanish & Portuguese: "somos".
Shouldnt it be "We are Rome" since there's no "in"?
Romae is here the locative case of Roma, implies the in, and means 'in Rome'.