It's just Crips and Bloods with rapiers instead of uzis.
And it's all about nothing. King and Cardinal are actually on the same side. The Cardinal may be wily and unscrupulous, but the king is a mean, ridiculous, money-mad playboy who fails to repay the loyalty he's given. Underneath all the colourful carry-on, Dumas' universe is as empty as Samuel Beckett's.
I'd forgotten or never realised- because I read him first as a serious-minded teen with a passion for literachur- just how funny Dumas is.