 While the poems in the thirteen-line stanza have generally been considered a part of the alliterative tradition, they have also been argued to be a related but distinct offshoot, incorporating elements of rhythm and metre that are in direct conflict with the conventions of unrhymed alliterative verse.The surviving stanzaic alliterative poems are generally of northern English provenance; some, such as "Somer Soneday" or "The Three Dead Kings", are of very complex form.The dialects shown in the surviving poems often point towards a northern and western provenance.