There may be some other explanation, but in case there is none to be found, it’s not uncommon for a new king/emperor to issue that sort of law over again if it looks like it’s being ignored.
Three documents control entry and use of Mt Athos.
The first document basically assigns ownership of the peninsula to the monks. This was done 885 when the Emperor Basilios the 1st issued a *Chrysobullo * (imperial edict) officially recognising Athos as a territory belonging exclusively to monks. It declared that only religious men should live there and all other laymen, shepherds etc, were forbidden to enter the “Garden of the Virgin”.
The second document covering rules and disciplines of Athanasios were formulated in the time of Byzantine Emperor Ioannis Tsimiskis who through his representative Euthymios confirmed the powers of the big monasteries.
This second document Typikon (Charter) was written in 971 AD and it still governs life on Athos today. It was written on a goat skin and for that reason it was called Tragos (Billy-goat).
The final document formalises controls over entry to Athos. These are defined in a Chrysobullo (edict) which was issued by the Byzantine Emperor Constantine Monomahos, in 1060 AD. It is still valid and decrees that: