John Sinklo (also Sinclo, Sincklo, Sincler, Sinkler, Sinclair) was an English Renaissance theatre actor, known to be active between 1592 and 1604.
[3] The stage direction ‘Enter Sincklo and three or foure officers’ within the 1600 quarto of Henry IV, Part 2, for example, is replaced by ‘Enter Hostesse Quickly, Dol Tear-sheete, and Beadles’ in the First Folio, suggesting that Sinklo was to play a beadle.
Much is made of Sinklo's skinny physique in this role, and the insults levelled at him by Doll Tearsheet include one tirade in which he is called "nut-hook" and "damned tripe-visaged rascal".
In another rant he is called "thin man in a censer...you bluebottle rogue, you filthy famished correctioner".
[4] Sinklo is named by John Webster in his special Induction to Marston's The Malcontent from 1604, being introduced by William Sly to Richard Burbage as 'Master Doomsday's son, the userer'.