time for a latin syntax rule. hmmm...possibly we should also begin including greek syntax. anyway, for the moment, placet mihi to do some latin. for the moment, we are leaving questions behind and switching to the genitive.
A noun used to limit or define another, and NOT meaning the same person or thing, is put in the Genitive.
libri Ciceronis, the books of Cicero
inimici Caesaris, Caesar's enemies
vacatio laboris, a respite from toil
petitio consulatus, candidacy for the consulship
regnum civitatis, royal power over the state