Now I know for certain why Isaac Newton is Lucian and not Ekaterina. In the Ekaterina archives there is a small file mentioning John Flamsteed. He and Newton were enemies even in real life. Isaac Newton lấy trộm, đánh cắp John's work because he wanted to đăng lên it under his own name and because John was reluctant to đăng lên it.
Rick Riordan knew that if they had been in the same branch they would have worked together, so he placed Isaac on the Lucian because of his sneaky tendencies.
Inside that book was the name of a clue. Later Flamsteed burned a large bunch of his sách to keep the secret within his branch.

this is a danh sách of all the certainly known famous Cahills. Not the ones that are ficional though.

Ekaterina
Einstien
Curie
Edison
Carter
T. Roosevelt
Gates
Wilhelm

Janus

Mozart
flying ace
Shelly
Dickenson
Houdini
van Gough
Spielburg
Jeffreson

Lucian

Franklin
Newton
Napoleon
Cathrine
Anthony
Churchill
Lincon
Shih
Reilly

Tomas

Oakley
Washington
Armstrong
Hideyoshi
Earhart
Elderle
Kaasen
Amundesen

Has anyone noticed that all the Holts are named after someone in American power?

Eisenhower Holt-President Eisenhower
Mary Todd Holt-President Lincon's first lady
Hamilton Holt-President Washington's secrtetary of the treasury
Reagan Holt-President Reagan
Madison Holt-James Madison's first lady
Arnold-Arnold Schwarzenegger

I don't know about bạn but this seems pretty weird.

Ekat,
Skynite

P.S. sorry about the Isaac Newton Conspiracy, I checked the website and their is no evidence of being Ekaterina. (He should be though. The only thing he did in the government was work at a mint!)