Name: Lord Gavin Rhys Philip Meredith, Marquess of Carmarthen
Race: Seelie Sidhe Baron, Welsh Marquess among the Mortals.
General information:
Lord Gavin Rhys Philip Meredith, Marquess of Carmarthen, is a British nobleman from Wales, where his family has extensive business interests in the textile industry. He is the only son and heir of the 3rd Duke of Monmouth. A diplomatic Trade Consul, Lord Gavin has been in America for just over a year, along with his young son, Dylan. Though he’s been in New York much of this time, business and diplomatic duties bring him frequently to Texas, and he has taken a small home (only 20 rooms) in Arlington.
Please note! This is human/mortal information! The “proper” way to address him is as Lord Meredith (or Lord Gavin, if you’re on friendly terms). He’s not a US citizen and has full diplomatic immunity. Although his age is hard to pin down (he seems to be somewhere in his early 30s), he’s incredibly good-looking. And incredibly arrogant as well.
Sir Gwalchmai Pencampwr Gwydion (Hawk of May, Champion of Gwydion) is the Baron of Llanfairpwll (part of Human Manhattan) and Crimson Springs (Arlington). He has something of a reputation for being rather traditional and very Gwydion (which sometimes translates to 'arrogant'). He's better known in his native Britain, for about a decade ago, he was raising a private army in a bid to become High King of Wales. He's been in Concordia for a few years now, along with his young son, an Eshu named Llew.
Lord Gavin will often claim (and no one dares dispute him!) to be a descendent of Caradoc (Caratacus) of the Royal House of Morganwg. This doesn’t refer to one of the Changeling Houses (he’s firmly a Gwydion), but to one of the Fifteen Tribes of Ancient Wales. The House of Morganwg descends from the Silures, a powerful and warlike Celtic tribe occupying approximately the counties of Monmouthshire, Breconshire and Glamorganshire in south Wales. They are particularly remembered for their fierce resistance to Roman occupation. If Gavin is indeed descended from the Silures, it would explain his black hair and darker skin, as the Tribe shares a genetic heritage with the Basques of northern Iberia.
See also: Dylan, Percy, Robin, and Caer-Adar.

(this is how Gavin appears in the comic, but not how he appears in the game)
Some notes on (human) titles.
Gavin’s father is a Peer in His Own Right, meaning he holds all his titles himself, by right of inheritance and by the authority of the Crown. Gavin, however, is not a Peer. The title he holds is a ‘title of courtesy’. What happens is that the eldest son of a nobleman is given his father’s next lower title to use, as if he holds the title himself. He gets all the rights and privileges of that title, except those accorded to the Peer (such as a Seat in the House of Lords).
So Gavin’s father is, in descending order of kudos, Duke of Monmouth, Marquess of Carmarthen, Earl of Glamorgan, as well as Viscount of something or other and Baron of something or other. These are titles he holds himself, beholden to no one but the Queen.
Gavin, as the eldest son, holds his father’s next-lower title as if it were his own: Marquess of Carmarthen. Dylan is Gavin’s eldest son, so he holds what would be Gavin’s next-lower title (which is currently held ‘in his own right’ by Gavin’s father): Earl of Glamorgan. If Gavin were to die before his father, Dylan would move up to Marquess of Carmarthen and be heir to his grandfather. And naturally, if Gavin is still alive when his father dies, he would be Duke of Monmouth (and take his Seat in Parliament), and Dylan would move up to Marquess of Carmarthen, while his theoretical son would hold the title of courtesy as Earl of Glamorgan.
Most of the ‘rights and privileges’ of these titles are irrelevant in America and on the game. They are both restricted, by law, from running for or serving in the House of Commons, but again, no chance of that happening in this game. The only important thing is that both Gavin and Dylan have the right (which they may or may not assert) to be addressed as ‘Lord’ in conversation and correspondence, rather than ‘Mister’. There’s a whole host of rules governing the etiquette of addressing people, formally and informally, in person or in reference, etc, but Gavin won’t expect the average American to know or follow these rules.