Word Study
jarl
CIDE DICTIONARY
jarl, n. [Icel., nobleman, chief. See Earl.].
A chief; an earl; in English history, one of the leaders in the Danish and Norse invasions. Longfellow. [1913 Webster]
OXFORD DICTIONARY
jarl, n. hist. a Norse or Danish chief.
Etymology
ON, orig. = man of noble birth, rel. to EARL
For further exploring for "jarl" in Webster Dictionary Online