This is a bit simplified - the history of the relationship between landowning, the church and monarchical power in Catholic Europe is fairly complicated.In Medieval times there were simple Nobility (Fighters), Knights or those Holy Knights that were either anointed or ordained by the Church (Paladins), and the Priests. Among Priests there were the normal every day priest and then there were the Landowners (Clerics). These Landowners were NOT knights, though they may be nobility by birth. In many instances a second son would be sent to the Church for "safekeeping" but if the eldest died...they then would be called for. They had combat training and were typically very able warriors.
They had NO HEREDITARY LANDS. The lands that they watched or governed were owned and regulated by the Church. The church (in this instance, in Europe it was normally the Catholic Church, but in Britain this changed later on) controlled a GREAT DEAL of land, much like nobility did, but they were owned in the name of the church. Thus, a Bishop could very well be acting in the same role as a Knight, but in this instance they would be as a representative as the Church. They would be the church's governance over the lands. However, the lands were NOT theirs or their families, it was the church's land.
And I don't think it's what Gygax had in mind when he wrote (in his PHB, p 20), that the cleric class "bears a certain resemblance to religious orders of knighthood of medieval times." And provided for clerics to seize land and rule it personally in just the same manner as a fighter does.
A paladin also may "construct [and] maintain a small castle" (PHB, p 24) - which differentiates paladins from the religious orders of knighthood, whose castles were built and owned by the order, not by an individual knight.
And on a slight (only slight) tangent, the Templar rule was authored by St Bernard of Clairvaux, who was a prominent holy man but not a warrior. You can't emulate St Bernard with either a cleric or paladin build, unless - in either case - you just ignore the fact that you're a seriously puissant melee warrior. Which reflects both my point, and also reflects [MENTION=82106]AbdulAlhazred[/MENTION]'s complaint about the lack of a non-warrior miracle worker in the classic D&D set-up.
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