Rhyme Royal:
The rhyme royal stanza consists of seven lines, usually in iambic pentameter. The rhyme scheme is a-b-a-b-b-c-c. In practice, the stanza can be constructed either as a tercet and two couplets (a-b-a, b-b, c-c) or a quatrain and a tercet (a-b-a-b, b-c-c). This allows for a good deal of variety, especially when the form is used for longer narrative poems and along with the couplet, it was the standard narrative metre in the late Middle Ages.
Rhyme Royal
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