Paladin subclasses - what are these?

[Arnulf]

Hi,

I'm in the progress of building a paladin with the main skill Fist of the Heavens.
Now he's level 63 and maxed FotH, Holy Shock, and I'm starting to fill up Holy Bolt.
So far -- Nightmare, Act 5 start -- it plays quite fun. Of course, the Lightning Immunes
give me a hard time, but that's okay. Probably this one is not viable in Hell difficulty.

Anyway, I've looked through strategy guides and I was wondering what all those
subclasses are referring to.

• Martyr
  <>
  
• Vindicator
  <>
  
• Templar
  <>
  
• Avenger
  <>
  
• Zealot<>
  [st]I have some ideas about Martyr (Sacrifice), Zealot (Zeal/Fanaticism), and Avenger
  (Vengeance/Conviction).
  
  But I don't know what the others are. Can someone fill me in, please?
  
  Are there more?
  
  Thanks,
  
  -Arnulf