The most famous example is Spenser's Epithalamion, whose long stanzas did play an astonishing metrical complexity, fairly illustrating the height of Elizabethan craft in verse.
Whatever vein he writes in—pious, courtly, satirical, cynical, or merely abusive—he is always the artist, with an artist's delight in language and meter for their own sakes.
Recognized by his contemporaries as the foremost poet of his time, Spenser was not only a master of meter and language but a profound moral poet as well.
Therefore, Chaucer is considered as a great master of the English language, for he greatly increased the prestige of English as a literary language and extended the range of its poetic vocabulary and meters.
The metaphysical poets wrote of God and of theology, of the court and of the church, of love and of nature with a high regard for form and the more intricate subtleties of meter and rhyme.