Hints;
I cross the lines: madness and genius
A early father I was born
Citadels I enjoy a plotting
An enigma I remain to those who know me
Who am I?
I cross the lines: madness and genius
Nimrod was both a genius for leading his people and also mean and strange
A early father I was born
Nimrod is an early character from the Bible
Citadels I enjoy a plotting
Nimrod built the famous tower of Babel
An enigma I remain to those who know me
Nimrod was an enigma, because he was actually correct in hoping for mankind to have a common language, but woefully punished by God who wanted differently. It's the paradox of universal difference and sameness.
Charles Babbage
He cross the lines: madness and genius
Charles Babbage is the father of the computer.
Citadels I enjoy a plotting
I am not sure about this.
An enigma I remain to those who know me
Computer use 0 and 1 so it's kind of encryption for some of us.