Havart var Moehoen

Havar var Meohoen served in the Nilfgaardian Imperial Army as Field Marshal after dead of Menno Coehoorn.

He was in a position of confidence with the Emperor Emhyr var Emreis, and so was granted governorship over Temeria along with another nilfgaardian, Mairwen Rhosyn. He also as his predecessor commanded the Center Army Group during the 3rd Northern War - his record included the several battles in Temeria, Velen and the Redania.

The Witcher 3: Wild Hunt
We can see him for the first time we come to Crows Perch in Velen, he is making deal with Bloody Baron but leaves when Geralt of Rivia comes, than he is only mentioned but not appears more.