Ramon Llull,
The Buke of the Order of Knyghthood
“ If the Church should make war against the Jews? If a man may defend his wife by force of arms? If a brother may defend his brother by force of arms? When a Baron is a vassal to two Lords of different countries, that have both of them war, whom of them he ought to serve? When a Baron is a vassal to two Lords that make war upon one another, whom of them he ought to obey? When a man is a burgess in two cities that make war against one another, which of them he ought to obey? Whether a man that is in bondage or in slavery be obliged to go to the wars with his lord and master? ”
