I've looked up the form, which seems to be ABBA, and one site said it was a variant of the Ballad form. A Rhyme Royal has 7 lines, so it can't be that.
In Memoriam Stanza- this form was used by Tennyson in his poem "In Memoriam" and is an envelope stanza written in iambic tetrameter (four feet). From "In Memoriam"
But I agree - it's not free verse
(just took out the text per #3 of the Rules & guidelines - you already had the link posted anyway)