LANGLINAIS? 

A few weeks after I finished writing My Beloved I found this old picture of a castle.   I frankly don't know what it's called or where it's located, but the similarity to what I had envisioned startled me.  This is exactly how I had imagined Langlinais.   You can almost see the river Terne below the North Tower and the retaining wall that featured so prominently in Juliana and Sebastian's story.