The dirk occupies a unique niche in Highland culture and history. Many Highland Scots were too cash-poor to buy a sword, but virtually every male carried a dirk—and carried it everywhere! If in Japan the katana was the soul of the Samurai, in Scotland the dirk was the heart of the Highlander. In many warrior cultures oaths were sworn on one's sword. Among the Gael, however, binding oaths with the force of a geas (involving dire supernatural penalties for breaking such an oath) were sworn on one's dirk. The English, aware of this, used the custom against the Highlanders after Culloden: When Highland dress was prohibited in 1747 those Gael who could not read or sign an oath were required to swear a verbal oath, "in the Irish (Scots Gaelic) tongue and upon the holy iron of their dirks", not to possess any gun, sword, or pistol, or to use tartan: "... and if I do so may I be cursed in my undertakings, family and property, may I be killed in battle as a coward, and lie without burial in a strange land, far from the graves of my forefathers and kindred; may all this come across me if I break my oath."