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I'm not sure in which chapter this took place exactly but

> this is after Rod Reiss transformed into a titan. Eren has the ability
> control titans, then why wasn't Eren able to control him with his titan
> power? He had Historia by his side who possesses royal blood. That doesn't
> make sense...

Why couldn't Rod Reiss be controlled?


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Manga Spoilers: Control over Rod Reiss


A very short answer is **because Eren doesn't know how to.**

Spoilers below:

> Eren has what that has been called as **"The Co-ordinate"** which was passed
> to him from Freida Reiss through his father. This is the ability of the
> Founding Titan which allowed them control over the titans and memory
> manipulation.  
>  We do not yet know how exactly this power works. The real limit of this
> power is unknown, but as it can be observed, it extends to the point of
> making Titans perform actions that threaten their own lives. It was also
> mentioned by Rod Reiss that the power is so strong, it has the potential to
> wipe out all the Titans if the user is able to wield it to its full
> strength.

Then why it was Eren was unable to use it while he had contact with a royal
bloodline, the reason is that Eren has only shown this power _under very rare
and unique circumstances_. One can argue that the danger to his life was one
such circumstance, but unless the writer clarfies the exact nature of this
power we don't know the limitations.

For more information, with **HEAVY SPOILERS** refer to : [Wikia : Founding
Titan](http://attackontitan.wikia.com/wiki/Founding_Titan)


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Heavy spoilers under spoiler section (until manga chapter 89 including)

> Eren is able to use Founding Titan power only when in direct physical
> contact with person of royal blood. He comes to this conclusion in chapter
> 89, which also explains events of chapter 50 (titans got Eren's order, while
> he had direct contact with Dina Fritz's titan), and chapter 62 (when Eren
> was able to see memories, stored in his titan, while Historia was touching
> him).

Now, regarding your question:

> Actual combat with Rod Reiss in his titan form has started somewhere around
> chapter 68, which was a lot earlier. So, basically, on that time, he had no
> idea, how to activate this power.


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