

All of today's Eldians have a common ancestor, Ymir. But in all Eldians there
is also a royal bloodline, Fritz/Reiss. This royal bloodline came from King
Fritz. As far as we know, King Fritz and Ymir have three daughters. Thus,
should not all Eldians be also descendent of King Fritz? This only makes sense
if Ymir had kids with someone else, other than King Fritz, but that is not
shown. What am I missing? Or is it a plot-hole?

To rephrase it.  
We know Ymir only obeys commands of the royal family and that's why the
Founding Titan can only be used by those of the royal family. But, if all
Eldians are her descendants, and she only had children with the royal King
Fritz, all Eldians should be Fritz. But, that is not the case. Why?


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attack-on-titan
How come not all subjects of Ymir have royal (Fritz) blood?


All Subjects of Ymir are Eldians, but not all Eldians are Subjects of Ymir or
Royal.

Technically, every subject of Ymir has Royal blood, but it is not enough to
make an impact. Remember, King Fritz was just a human and his bloodline can be
diluted to the point where Ymir does not recognize it and all subjects are
connected through Paths so that can not be diluted. Only one of the 3
daughters was kept as the Queen of Eldia and kept the Royal Family bloodline
as pure as possible (possibly through incest, IDK. Historia was not a result
of incest so it is a bit confusing). The other 2 were used as breeding
machines to create more subjects of Ymir, diluting the Royal blood immensely.


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I'm going to go with the original poster and claim this as a plot hole.

Every Subject of Ymir should be able to trace their lineage directly back to
Ymir and the first King Fritz. Incest isn't mentioned and Fritz's last wish
for his daughters was to reproduce as much as possible to pass down the
Titan's power. This would mean the daughters would need to take "lowborn"
husbands to pass on the bloodline. Again, incest isn't mentioned, so Fritz's
grandchildren would also take commoners as mates (male or female), so forth,
and so on with every generation. With Fritz and Ymir as the progenitors for
ALL subjects of Ymir and excluding incest (since it isn't mentioned), I can't
think of a way for the royal bloodline to be so indistinguishable enough for
the Founding Titan's power to be passed down only through a specific lineage.

For all intents and purposes, every Ymir Subject is as much of a cousin to the
next and any Ymir Subject should (theoretically) be able to use the Founding
Titan's power. Unless it's passed down through the male lineage, but Fritz
didn't have any sons. Unless it's passed through the female lineage, but what
would make a daughter from Sheena more apt to the Founding Titan's powers than
a daughter from Maria, since they are both direct descendants from Ymir/Fritz?
Unless it's passed down through the Fritz's ruling line of succession, but
that's just through a naming convention to where, if that were the case, then
the FT's power simply follows a named successor (and that's just silly).

Hmm, my last point may very well be the case of how the bloodline remains
"distinctly Fritz" \- in name only, I guess.


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Remember that Ymir/Founding Titan can change whatever they want with Ymir's
Subject that includes everyone, and since one of them is the successor to the
queen, then King Fritz can just make Ymir do it and change whatever it is on
their body.

It's on season 4 where they discuss there was a plague and then Ymir changed
the insides of Eldians and since then, everyone is immune to it, like the
queen can literally make her newborns an animal or a superhuman and she may
even be possible to her newborn to a titan without using spinal fluids.

Maybe that's why there are 7 titans? Maybe that's why some Founding Titan may
have to make a little more but scared of a betrayal like she made those
Colossal Titans for the wall. Maybe, a long time ago, there were more titans
(maybe, just maybe, that could have happened) and maybe those 7 are the only
survivors of the great titan war.


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I'm going to refer back to my answer
[here](https://anime.stackexchange.com/a/66510/19307).

The original Ymir exists inside of the Coordinate as a thinking entity. She is
the one who is the gatekeeper to who is allowed to use the power of the
Founding Titan. Due to her time as a slave and all the trauma she suffered in
life, she was very loyal to King Fritz and did whatever he told her to do.
This loyalty can be thought of as mental conditioning, brainwashing, or a fear
of disobeying, but whatever the case, it was shown as a fact in the episode
_From You, 2000 Years Ago_ that she obeyed Fritz unconditionally.

This "loyalty" continued even after Ymir died and she was reduced to whatever
she is inside the Coordinate. According to the
[wiki](https://attackontitan.fandom.com/wiki/Subjects_of_Ymir) at least, it
does indeed seem to be stated somewhere that everyone who can turn into a
Titan is descended from Ymir. So, what's the distinction between those of
royal blood and the regular Subjects of Ymir? We don't actually have to
understand the distinction. All we have to know is that Ymir knows the
difference. Perhaps the distinction is even nonsensical, but so long as Ymir
believes there is a distinction, she will use it to decide whether to obey or
not. She exists as a thinking entity, after all, and with her mind as broken
as it is, it makes sense that it wouldn't make sense. Once you put a person in
charge of deciding these things, rather than a force of nature which cannot
err, all bets are off.

And this is just speculation now, but perhaps, as with the vow to renounce
war, the choice for Ymir only to obey members of a certain lineage was
something imposed on her some point after King Fritz. Or perhaps it was a
sanity check for Ymir, because with so many descendants, she'd almost have to
give precedence to some (though this particular theory might not hold much
credence, given how time works vastly differently inside the Coordinate).
There's been some suggestion that inbreeding of the royals may also have kept
the royals more genetically similar to Ymir, which could be the case. Whatever
the case, if the explanation makes sense to you, it might make sense to Ymir,
and Ymir's the one deciding, so...

Getting back to my original theory, what exactly is the proof that Ymir is the
one deciding who is royal and who isn't? It's the fact that she's able to
change the rules!

> In the same episode, Eren Yeager is able to gain control of the Founding
> Titan. Sure, he has to play by the rules to get to the Coordinate and get an
> audience with Ymir, mainly by going through Zeke who has royal blood, but
> once there, he's actually able to convince Ymir to let him use the power. I
> forget exactly what Eren said to convince her (might check later and update
> this), but essentially he appeals to Ymir's desire to stop being a slave.


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This question has been bugging me for weeks now.

And I am convinced that I found the answer. So, Maria, Rose and Sheena were
pushed to reproduce to save the "powers" of Ymir right?

But there were only 9 Titan Powers.

So let's say each of them had 5 babies. That's 15 descendants of Ymir. But not
all of them will be considered royal blood. I think only those who inherited
the 9 titan powers will be dubbed to be royal at the time. Considering how
Ymir the slave only became royal after gaining the titan powers.


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This is only my theory:

Based on what we see of Ymir's past, I believe it is safe to say that Ymir
wasn't King Fritz's wife, but his _concubine_. The "royal blood" doesn't refer
to all of the children King Fritz had _but only_ those he had with his 'legal
spouse'. In time these descendants (or at least some of them) had children
with the 'Subjects of Ymir' and I think the first child resulting from such a
union was the first Founding Titan after Ymir.


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