Definition of "healme"

The mightie monarch of a royall realme, Swaying his scepter with a princely pompe, Of his desires cannot so steare the healme, But sometime falls into a deadly dumpe; When as he heares the shrilly sounding trumpe Of forren enemies, or home-bred foes, His minde of griefe, his hart is full of woes.

1594, Richard Barnfield, The Affectionate Shepherd‎