Roppongi (6 Trees)
Legend has it that the area was the location of the lower residences of 6 daimyō. A daimyō is a feudal lord. They were required to serve the shōgun in Edo and represent their domains in the capital. Most of them about 3 residences in Edo, an upper residence next to Edo Castle (now the Imperial Palace), a middle residence a little farther out, and a lower residence in the suburbs of Edo.
There’s another story that there were 6 pine trees here, but that just sounds stupid…or boring at best.