Was doing a re-read of the series again and noticed this in Through Fiery Trials. Pg 1085/2099 (Iphone), or about 51.7% through the book.
King Rahnyld is saying "No one in Dohlar's missed the fact that this is your first visit ever to any mainland realm outside Siddarmark or Silkiah."
I was wondering.. When did they (or one of either Cayleb or Sharlyaen(sp?) ever go to Silkiah? Was this mentioned before as part of that Canal Treaty between Siddarmark/Charis/Silkiah?