Definition of "clodpole"

[…] this letter, being so excellently ignorant, will breed no terror in the youth: he will find it comes from a clodpole.

c. 1601–1602 (date written), William Shakespeare, “Twelfe Night, or What You Will”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals)

‘Show the dullest clodpole,’ says my invaluable German friend, ‘show the haughtiest feather-head, that a soul higher than himself is here; were his knees stiffened into brass, he must down and worship.’

1843 April, Thomas Carlyle, “VI, ’’The Landed’’”, in Past and Present, American edition, Boston, Mass.: Charles C[offin] Little and James Brown, published 1843, book IV (Horoscope)

There lay Tom; hobnail Tom! a bacon-munching, reckless, beer-swilling animal! and yet a man; a dear brave human heart notwithstanding; capable of devotion and unselfishness. The boy's better spirit was touched, and it kindled his imagination to realize the abject figure of poor clodpole Tom, and surround it with a halo of mournful light.

1859, George Meredith, chapter 9, in The Ordeal of Richard Feverel. A History of Father and Son. […], volumes (please specify |volume=I to III), London: Chapman and Hall