Chantry Historian ~~~~~~~~~~~~~~ There are four books to collect all of which can be found inside the Chantry. You can collect three books at the beginning of each Act. The fourth book is missable and can only be picked up while confronting Sister Petrice in the Chantry.
The Vicounts son is dead at the podium and the book is sitting on top of it. However you must collect this book while your fighting. Once everyone is dead pick it up quickly. A cut scene triggers a few moments after the battle ends kicking you out of the Chantry and never seeing the book again.
When the Vicount tells you the Arishoks delegate has gone missing go to the docks and tell the Arishok. This must be done before you try to save the delegate in the sewers. Once you witness the delegate get killed tell the Viscount not to do anything to the body because the Arishok will know (don't burn the bodies). Later on (mandatory story cut scene) tell the Arishok Isabela stole the book. This should trigger the trophy.
^also after you finish the sheparding wolves quest in act 1, got to to the arishok and tell him you killed some of his men, im pretty sure that earns some respect.
dont remember all the brotherhood of three ones but for Act 1 there is one in the gallows, viscounts keep, uhmm lowtown at ngiht i think, and i htink theres also one in the bone pit, just search around in those areas. just google a trophy guide, very helpful.