Canon 147

Inside the territorial boundaries of the patriarchal Church, the

power of the patriarch and the synods is exercised not only over

all Christian faithful who are enrolled in that Church, but also

on others who do not have a local hierarch of their own Church

sui iuris constituted in the same territory and, even if they remain enrolled in their own Church, are committed to the care of

local hierarchs of that patriarchal Church with due regard for

can. 916, 5.