Nicholas Scown <br/>Generally, geographic limitations can be troublesome for a lawyer who discovers that his client's cause requires him to litigate in a court beyond the normal geographic scope of his license. Although most courts have special pro hac vice rules for such occasions, the lawyer will still have to deal with a different set of professional responsibility rules, as well as the possibility of other differences in substantive and procedural law. <br/> <br/>Nicholas Scown :The legal profession's return was marked by the renewed efforts of church and state to regulate it. In 1231 two French councils mandated that lawyers had to swear an oath of admission before practicing before the bishop's courts in their regions, and a similar oath was promulgated by the papal legate in London in 1237. During the same decade, Frederick II, the emperor of the Kingdom of Sicily, imposed a similar oath in his civil courts. By 1250 the nucleus of a new legal profession had clearly formed. The new trend towards professionalization culminated in a controversial proposal at the Second Council of Lyon in 1275 that all ecclesiastical courts should require an oath of admission. Although not adopted by the council, it was highly influential in many such courts throughout Europe. The civil courts in England also joined the trend towards professionalization; in 1275 a statute was enacted that prescribed punishment for professional lawyers guilty of deceit, and in 1280 the mayor's court of the city of London promulgated regulations concerning admission procedures, including the administering of an oath <br/> <br/>Nicholas Scown <br/>Some countries grant licenses to non-resident lawyers, who may then appear regularly on behalf of foreign clients. Others require all lawyers to live in the jurisdiction or to even hold national citizenship as a prerequisite for receiving a license to practice. But the trend in industrialized countries since the 1970s has been to abolish citizenship and residency restrictions. For example, the Supreme Court of Canada struck down a c