Along comes a wife - bit more details:
The players are now mover and shakers in the empire, the king has noted them and as such, they have become part of the game of thrones. Because they are low at this time, rich merchants may want to tie trade deals with them, the best is that the castle opens up a shorter trade route; the control of this route is risky but can lead to a lot of money. So, arranged marrage is a logical step. Toll roads and stopping points are money makers.
You also have other nobles, maybe close to the land that now want to tie their family to it and again, arranged marrage to the characters. This could allow them some peace of mind, from being attacked.
The point is that the castle is part of a bigger game, the players also.
The players are now mover and shakers in the empire, the king has noted them and as such, they have become part of the game of thrones. Because they are low at this time, rich merchants may want to tie trade deals with them, the best is that the castle opens up a shorter trade route; the control of this route is risky but can lead to a lot of money. So, arranged marrage is a logical step. Toll roads and stopping points are money makers.
You also have other nobles, maybe close to the land that now want to tie their family to it and again, arranged marrage to the characters. This could allow them some peace of mind, from being attacked.
The point is that the castle is part of a bigger game, the players also.