The source that belongs to Ilien is scattered to the near countries. In Aerenwe, Ilien has four source holdings, in Roesone, Ilien has three sources and in Medoere Ilien has only one. In Ilien itself there is no usable source none with powers to cast realm spells, so it is not of much use when dealing matters which need magic.
As said before Erinn (see Ilien) is not a wizard, and up untill now the regent of Ilien has most of the time been a wizard. To compromize this Erinn hired a court wizard (see Ilien), who controls the sources. He has a good realitonship towards the neighbouring court wizards and is always looking for more.
Rumors have been spreading about a new source, but no progress has been made. Rogr Aglondier (see Ilien) is belived to have been looking for the "new source", and so it is not unlikely the court wizard wants the same.