In the morning persons who Anitami demon-aided investigators concluded there was enough evidence to try are taken to trial. The Emperor's has a sizable audience and a panel of five judges.

He affects boredom.

Will he answer a long series of questions about whether he authored this atrocity and whether he approved this one and whether he knew of this and what mechanisms were considered that could have avoided this...

If the questions are framed in ways he doesn't like he will pretend that he isn't quite sure what they mean, but he will tell them bits of his autobiography as he sees it.

They take a break for lunch. 

(The other trials conclude. One of the Emperor's wives and three of his children are sentenced to death, most of the rest to varying lengths of imprisonment. One of them does a very convincing impression of a devoted humanitarian struggling to maneuver herself into a position from which she could reduce the empire's wrongdoings. The judge is not totally persuaded but is at least convinced she'll be well-incentivized in future, and lets her off entirely.)

He eats a little of lunch.

They have more questions in the same vein. They ask if there is any additional information that should come to the attention of the court.

"I remain convinced that consistent eugenic population control is essential for the well-being of the planet as a whole and that my Empire worked toward that goal."

"Duly noted."

They sentence him to death. They order a painless poison made available to him immediately, and a hanging scheduled for two days in advance should he decline to take it. 

Guards escort him back to his cell.

He solicits writing materials.

He gets them.

He writes up a will, with a preface that he doubts it will be honored.

What's he willing, and to who?

His land and possessions and titles and so on.

He is correct to expect this not to be honored; assets are being distributed for restitution.

A blue accompanies the guards at the next change of shift. He pulls up a chair and watches the Emperor interestedly.

The Emperor looks at him.

"I heard that you wanted to know who we were. It seems only fair to answer that, if you remain interested."

"Go on then."

He hands him a book. It's called The Collapse of the Oahk Empire. The date on the inside cover is ten years in the future.

...the Emperor notes this and consults the table of contents.

It sketches the outlines of growing political volatility, a coup in two years, the grants made to credible secession movements afterwards, the states that arose from that.

He flips to the bit about the coup. Sighs.

"We're Anitami. It's 3426. Consistent, universal population control was the greatest humanitarian step forward in history. Permissions systems turn out to be a terrible way to implement it."

"Tapa's system worked as far as it went."

"That's the one that caught on, yes. A couple states stuck with permissions. They were, well, states whose citizens could not emigrate because it was impossible to find anyone who wanted to live there, for one thing, and not leaders in science or technology or innovation, for the other."