Iambic pentameter is probably the most prevailing and widely used meter in classical English poetry, and it's the 'standard' form of verse in many forms of poetry such as sonnets. From Wikipedia (admittedly not the best of sources):
The most frequently encountered metre of English verse is the iambic pentameter, in which the metrical norm is five iambic feet per line, though metrical substitution is common and rhythmic variations practically inexhaustible. John Milton's Paradise Lost, most sonnets, and much else besides in English are written in iambic pentameter. Lines of unrhymed iambic pentameter are commonly known as blank verse. Blank verse in the English language is most famously represented in the plays of William Shakespeare and the great works of Milton, though Tennyson (Ulysses, The Princess) and Wordsworth (The Prelude) also make notable use of it.
How and why did iambic pentameter become so prevalent? Why this particular choice of meter, and how did it happen - e.g. was there one particularly prominent writer who favoured it and influenced others?
Related, but not duplicates: