"On Shakespeare, 1630" is written by -

‘On Shakespeare. 1630’ by John Milton is a sixteen-line poem that is contained within a single stanza of text.
Due to the rhyming nature of the lines and the composition of the text itself, the piece may be considered a sonnet.  Additionally, a reader should consider the subject matter when trying to categorize this piece. The speaker focuses on eulogizing the life and work of William Shakespeare, thereby making this piece an epitaph. This type of poem is often short and witty, they generally focus on the death of a specific person. Milton was seeking to honor Shakespeare the man, but more importantly his literary contributions. 

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On Shakespeare 1630
BY JOHN MILTON
What needs my Shakespeare for his honoured bones,
The labor of an age in pilèd stones,
Or that his hallowed relics should be hid   
Under a star-ypointing pyramid?
Dear son of Memory, great heir of fame,
What need’st thou such weak witness of thy name?
Thou in our wonder and astonishment
Hast built thyself a live-long monument.
For whilst to th’ shame of slow-endeavouring art,   
Thy easy numbers flow, and that each heart   
Hath from the leaves of thy unvalued book
Those Delphic lines with deep impression took,   
Then thou, our fancy of itself bereaving,   
Dost make us marble with too much conceiving;
And so sepúlchred in such pomp dost lie,
That kings for such a tomb would wish to die.