Apex Predators - Dragons?

 Back in 1st edition dragons were pretty darn weak.   A max strength red dragon had at most 88hps.  This beast would go down in a fight pretty fast against a 14th lvl party, so I tripled there hit points and made them formidable foes like they should be.  I once gave a dragon claws that were equivalent to swords of sharpness.  It was a limb reducing experience for that party.  This dragon was a gold dragon.  The party thought, oh look a friendly dragon, lets go parley with him.   After some conversation, the dragon attacked and someone queried, hey your a gold dragon, and it said "Yes, I'm a gold dragon that was raised by reds."   

I have a few historical dragons and one of the present that are legendary.  They came out with legendary status is one of the Epic books or some other tome I read at Borders.   These dragons and other creatures of legendary status were akin to the tarrasque.

• Tauth'ghourn - this was a blue dragon, when it died, one of the thirteen swamps of Meldar were named after him.  This dragon is signficant since it acted as a buffer between the dragonborn and the tiefling.  When he died, war erupted between those peoples and would continue on and off till both of empires crumbled
•  Apocalypse - this dragon helped build Iglutt, or at least his slave army did
• Sebgult - the oldest and meanest dragon of this part of the world, when this dragon stirs, and it is very rare now, you can say goodbye to some city - still need some fill-in material for that dragon, you got some mayham that you think he caused - then write it up and make it Bal-Kriav canon
• Amaglothorn - this white dragon created Ice Tear, and with it nearly destroyed two empires, whites have been known as the most chaotic and reckless of the chromatic dragons, the recklessness usually gets them killed
• Bothorthesh - was a red dragon.  Dragons don't always hole up in some ruined keep or cave, some build empires.  Dragons forming empires has largely happened in the Aerie of Dragons.  Thashangriel was founded by Bothorthesh.
• Hellbleaker - was a red dragon that founded Goth-Dyvermoir 
• Khiruphandân - was a green dragon that founded Maratazîr  
• the list goes on - check them out under Other Heroes (basically an area for Heroes with a lack of material for a full page)