[@Jamesyco]

Exactly. The holiest of holies. Or so they believe. 

Magic would follow typical fantasy settings yes. So magical schools would come into play but you aren’t limited to delving into one school. It just depends on how you wanted to build and present your character. 
You could make your paladin/knight work well with great swords or axes but also know some healing/protection magic. Light based magic to banish darkness and things of that nature. 
Completely up to you! 

But yes for healing and divine I would say that stick to the Holy/White magic school field. Conjugation or Biothaumaturgy.