The interests of commerce have frequently made it necessary to maintain ministers in foreign countries where the purposes, either of war or alliance, would not have required any. The commerce of the Turkey Company first occasioned the establishment of an ordinary ambassador at Constantinople. The first English embassies to Russia arose altogether from commercial interests. The constant interference which those interests necessarily occasioned between the subjects of the different states of Europe, has probably introduced the custom of keeping, in all neighbouring countries, ambassadors or ministers constantly resident even in the time of peace. This custom, unknown to ancient times, seems not to be older than the end of the fifteenth or beginning of the sixteenth century; that is, than the time when commerce first began to extend itself to the greater part