Bvt whether ye suffer your sillable to receiue his quantitie by his accent, or by his ortography, or whether ye keepe your bissillable whole or whether ye breake him, all is one to his quantitie, and his time will appeare the selfe same still and ought not to be altered by our makers, vnlesse it be when such sillable is allowed to be common and to receiue any of both times, as in the Dimeter, made of two sillables entier.
"The Arte of English Poesie"
George Puttenham
A verse containing one iambic foot is called iambic monometer; two feet, iambic Dimeter; three feet, iambic trimeter; four feet, iambic tetrameter; five feet, iambic pentameter; six feet, iambic hexameter.
"Elementary Guide to Literary Criticism"
F. V. N. Painter
For reasons of choice in the latter case, see Observation 1st on Trochaic Dimeter.
"The Grammar of English Grammars"
Goold Brown