excellent article on the Clerics of Blackmoor over at his blog. Well worth a read. Clerics were the one class that originated in the Blackmoor Campaign. You can also read some more comments by myself and others on this topic over here.
Back in 2011 I wrote a piece on Mike Carr's character in Dave Arneson's Blackmoor campaign, Bishop Carr, who might well have been the first Cleric in the history of D&D.
Would you be interested in playing a Cleric in a Blackmoor Campaign?
Image source: http://thesignmaker.deviantart.com/art/Sean-Connery-179541605