Jacob Mogensen Ulfeldt

Jacob Mogensen, or Ebbe Ulfeldt (c. 1600 – c. 1670), was the brother of the Danish naval officer Corfits Ulfeldt, and became a landscape painter in Delft.

[1] He is probably the "Delvenaar" referred to as "Ugaart", in Arnold Houbraken's Schouburg.

According to Houbraken, Ugaart Delvenaar was a good landscape painter who lived in the same period as Jan Verkolje.

[3] He wrote a biographical sketch for a Steenwinkel who worked for Christian IV of Denmark-Norway in 1640.

Possibly Morten and Henrik were the same person or brothers travelling together, but all these men would have known and consorted with each other as Danish compatriots in the small painter circles of Delft and Amsterdam.