De jure belli ac pacis was created in 1625.

jure power = legislation ;facto power=justice

"De jure" means "concerning law" while "de facto" means "concerning fact". A state may be de jure sovereign without being de facto sovereign, because a greater nation maintains economic or political hegemony over them, as Syria did with Lebanon. Or vice versa: de facto sovereign without being de jure sovereign, like the tribal areas of Pakistan.

Custody may be characterized as 'de facto' or as 'de jure'. A 'de facto' custody refers to the custodial arrangement that 'in fact' is in effect. This arrangement may or may not tally with a 'de jure' custody. A 'de jure' custody refers to the custodial arrangement that is approved according to the particular standards and systems of law.