Here's what I came up with. It's convoluted in the way only crazy fantasy-medieval stories can be.
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Kyria Estanes is the daughter of Ursula Estanes from her marriage to the doomed old Lord Harkwood, who then married Rugar Estanes, the brother of Oriana Chelias...the wife of the king of Chelias. The Estanes, a small frontier House whose control of a few strategic resources is the only thing that keeps them on the map, had their fortunes change with the unexpected marriage to the royal House. They mean to see to it that this fortune is not lost.
Haughty Prince Liam; an embarrassment to his father the king, was an opportunity for Rugar and Ursula Estanes. With the cunning born of being underdogs, they laid their plans. Rugar and Ursula had a son together as well as Ursula and Harkwood's daughter; the elder of the two. The son was needed to carry the line, but the daughter... Well, a diplomatic marriage was possible, but they saw another possibility. She was still quite young, and there was time.
The girl was already tomboyish and a scamp as a child, with a reputation for sneaking around the old keep through passages only she knew of, and making mischief. Qualities they could use. The training began.
Years later, and after consultation with Oriana, the Estanes presented their
son Kurt to be squire and manservant to Prince Liam.
The king and queen knew the deception, or thought they did. They knew 'Kurt' was Kyria, a girl. They had seen Kyria's skills and were impressed. Disguised as a boy, for her protection, and for the protection of reputation, and for the simple fact that Liam would be more likely to listen to her that way.
And of course, the crafty Estanes wouldn't MIND if their daughter and the Prince took a shine to one another either. But even if not, they had a tie to the royal family's next generation. A weaker one than Oriana, but it was something they could work with...
As for Kyria, she plays the part dutifully for now, perhaps out of loyalty, perhaps out of an agenda of her own.
Human Rogue 1
Str 11 1
Dex 18 10 +2
Con 12 2
Int 13 3
Wis 12 2
Cha 12 2
BAB 0
HP 8+
Init +4
Fort +1
Ref +6
Will +1
Race
Bonus Feat
Bonus skill
Etc
Class
Trapfinding
Sneak attack 1d6
Feats
1 Point Blank Shot
B Combat Expertise
Skills 10
Acrobatics (Dex) +8 (1 + 4 dex + 3 class)
Bluff (Cha) +5 (1 + 1 cha + 3 class)
Disable Device (Dex) +8 (1 + 4 dex + 3 class)
Disguise (Cha) +5 (1 + 1 cha + 3 class)
Knowledge (local) (Int) +5 (1 + 1 int + 3 class)
Perception (Wis) +5 (1 + 1 wis + 3 class)
Perform (Cha) +5 (1 + 1 wis + 3 class)
Sense Motive (Wis) +5 (1 + 1 wis + 3 class)
Sleight of Hand (Dex) +8 (1 + 4 dex + 3 class)
Stealth (Dex) +8 (1 + 4 dex + 3 class)