The Imperial Charter, Article II, Section A states the following:
"All law set down by the Landsraad shall be recorded in the Lawbook."
The LawBook, IV, A, 1, a. states the following:
"The Landsraad must place all permanent laws of the Land of Shireroth into the Lawbook of Shireroth, which shall be maintained by the Prætor of Shireroth."
This implies that anything not recorded in the LawBook is not to be considered as law, or as a temporary law. In the interest of clarity, practicality and common sense, I rule that the Prætor is restricted to three citizenships, including his Shirerithian one, even without Imperial Decree 347.
Furthermore, if the Landsraad "clearly intended" to restrict the Prætor to two citizenships, they should have made sure that such a law was added to the LawBook.
This ruling may be appealed to the Kaiser within seven days.