Rudolf II, Holy Roman Emperor

Rudolf II (July 18, 1552 – January 20, 1612) was the holy Roman emperor and lived in Prague castle, where he invited many notable figures.

Biography
At one point, people spoke of a monster that was roaming Prague, hunting noblemen and alchemists alike. The citizens of Prague criticized Rudolf II for being weak and not doing anything to stop the monster.

In response to this, Rudolf called many alchemists to meet him and discuss what should be done to get rid of the threat. It was decided that all notable alchemists of the city would be protected by the city guards.

Rudolf II was also the one responsible for the imprisonment of Edward Kelley, though he restored his status after his release. However, the Emperor did not fully trust Kelley, as he had his house placed under surveillance.

He eventually orders the city guards to take Edward Kelley back to the prison, which, indirectly, resulted in his death.

Source

 * Assassin's Creed: Project Legacy - Divine Science: Chapter 3 - Elizabeth Jane Weston