> > PS Where you say Agli - at the end this should be IMO - to Egil

(Agli is the dative - acc. or something of Egil)

Egill - nominative
Egil - accusative
Egils - genitive
Agli - dative

Compare 'ketill' (dat. katli), lykill (dat. lukli).

> > "Lát þú enga menn vita,"

> " You let (imperative ?) no men know"

That's right, it's imperative.

LN