usurper

who: oberyn martell & rhaegar targaryen
where: back in king's landing, post-harrenhal
when: right about the time of this exchange
what: a poisoned book

( You have no right to tell me what to do. You see poison but I see a Westeros united behind a strong and nurturing leader. )

who: arthur and ashere dayne, plus a rhaegar cameo!
where: the red keep, king's landing
when: soon after the dornish come to king's landing
what: what brothers don't have issues?

( Someone has wounded the Sword of the Morning. )

who: aerys targaryen, arthur dayne and rhaegar targaryen
where: king's landing
when: after the burning of that unfortunate storm lord
what: rhaegar takes a stand

( Could dragons chill? )

who. several folks. a veritable cluster-fuck of who's who in king's landing. and lots of honourable mentions, btw. the main players are, however, aerys, rhaegar and arthur dayne.
what. aerys doesn't have to wake his dragon. the damn thing never sleeps.
when. after elia's consent but before the twins' meeting.
when. king's landing; the throne room and the white tower.

( Go, my songs, seek your praise from the young and from the intolerant, Move among the lovers of perfection alone. Seek ever to stand in the hard Sophoclean light And take you wounds from it gladly. )

who: arthur dayne & rhaegar targaryen
where: the red keep
when: just after rhaegar speaks to jaime.
what: bromance between blonds.

( Speak to our muscles of a need for joy. )