Well, "His Story" is alway the story as told by the victor or told to enhance their prestige or hubris in general .. of course, assuming that the victor is male.
So whoever "wins" in the time-manipulation game is writing their own "story" which in the time-manipulation business becomes "history" (or "herstory" for that matter)
By now that data is lost in time ... and the manipulation there of.
If we look at google, its AI says
"The history of the Time Lords in Doctor Who is full of contradictions and supposition. Here are some details about the creation of the Time Lords:
The Timeless Children
In the 2020 episode "The Timeless Children", it's revealed that the Time Lords were originally part of the Shobogan race. They were genetically altered with the DNA of "The Timeless Child", who later became the Doctor.
Omega
The scientist Omega created an energy source to power time travel experiments by manipulating a nearby star with the Hand of Omega. The star exploded into a supernova and then collapsed into a black hole, but Omega survived in an anti-matter universe. Omega created the Eye of Harmony, which gave the Time Lords the ability to travel through time."
It goes on, but the other entries don't deal with their ability to manipulate time.
Oh, sorry, did I imply that the Menders of Ouroboros are (or based on) Time Lords?
... I guess that is another story ... or you can just get the badge - https://homecoming.wiki/wiki/Time_Lord_Badge and make it part of your character's story
Through timey-wimey means.
Yes. At some point in multiple timelines they did because they felt it was necessary.
Dependant upon which time line it was created for different reasons and the labor was supplied by different and/or multiple races of beings sometimes by beings of this dimension and sometimes by beings of other dimensions or even separate timelines that cross at nexus points.
Ever hear of The Master?
Is it always other time manipulators/travellers or those that have found out that time manipulators/time travellers have been manipulating their timestream either accidentally or intentionally.
Only time will tell.
The Secret is that there are those manipulating time.
Schrödinger's Cat is a famous thought experiment that demonstrates the idea in quantum physics that tiny particles can be in two states at once until they're observed. It asks you to imagine a cat in a box with a mechanism that might kill it. Until you look inside, the cat is both alive and dead at the same time.
It both is a "sham" and isn't a "sham" at the same time.
Of course, when you go on an Ouroboros mission, are you helping to "mend" the time stream or are you "manipulating"/changing the time stream just because you can?
Isn't the secret that you have the power to manipulate your own character's timestream through the use of Ouroboros missions?
I mean I think it used to direct you to a Mender for missions the first time you gained access, but, at this point, with all the time stream manipulation, characters can get there super easy. People are constantly ripping a hole in the time stream to cart people off to the Ouroboros right next to Ms Liberty just after their timeline has been created within Paragon City. So, yeah, I guess the "secret" isn't much of a "secret" any more. Just anyone can barge in there whenever they want at this point.