Now that the Ottomare's inhabit the south, I'm going to assume that the Imperial Hetiandi's knowledge of the south is from pre-Ottomarian times, before it was conquered by Emporer Sunblaze I and turned into the Ottomare Empire - which was roughtly 130 years prior to the current time.
On a side note, I'm just catching up on the roleplay, and it sounds like our factions are very compatible.