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I was originally planning to write of Philadelphia Carey, though I think most about her can be found here, though like always I'd be not too sure about the place of birth given although I didn't have the ability to properly verify most of it (though the part about Earl of Essex is interesting, I have no idea where they pulled the place of birth however)
 

What sorta got my interest is that apparently according to the same website, Robert Carey married Elizabeth Trevanion which while it don't seemt like much, her birth mother is given as Sybilla Morgan and the parents  of Sybilla apparently are  Thomas Morgan and Elizabeth Whitney, meaning he married a first degree cousin.

Mind you there is nothing particular odd about this at the time since such liason were common in the nobility. I mainly look into this because I thought approaching the Carey geanalogy from Sybilla may help.

Problem is though that she and her husband are probably even more obscure than Thomas Morgan so far I've found two diverging version of the event. A big problem is that there is no defintivie answer.

First one is the one I've mention prior hand which to come from A genealogical and heraldic dictionary of the landed gentry of Great Britain & Ireland for 1852 around page 1432, I'm pretty sure this is the source of most recent claim as to a cousin relation between the two.

Second one while interesting is just as much as a end dead. It come from a survey of Cornwall 1620 (page 240) as you can see it put a bit more uncertainty as to the exact lineage of Sybilla. Her father is given as simply a Morgan from "Lockstowe" which seem to be nowhere on the map except in those page. While we have seen arkstone (Thomas presume home village) the name don't quite fit except for the last part and apparently at the time another line of Carey was of importance in Langstone. I've found some hint of a Morgan lineage in the town of Langstone, but can't quite quite confirm anything at the moment. Either way trying to lock in on the pair seem fruitless 

You would think the memoirs of Robert Carey would shed some light on the issue but his memoirs are, but nothing about his marriage indicate it was one between cousin. It seem however he has a level of infatuation with his wife as he married for her character apparently rather than some sort of larger political machination (page 51) Queen Elizabeth was actually pissed off by this marriage without authorisation but his father was fine with it.