Complex sentence: This right, entitlement or "title", began to be granted by decree in the form of the writ of summons from 1265 and by letters patent from 1388, and the barony started to become personal rather than territorial.
Split into simpler sentences: This right, entitlement or "title", began to be granted by decree in the form of the writ of summons from 1265 and by letters patent from 1388. As a result of this, the barony started to become personal rather than territorial.