Like all agricultural societies, Korean life has always centered on tightly knit families. Large families have been prized and over many centuries families intermarried within the regions of Korea to form large clans. Family names reflect this. A dozen family names predominate, especially Kim, Park, Lee, Kang, and Cho. Custom forbids people marrying within their own clan, no matter how distant the cousin might be. In order to know who is who, families and clan keep detailed genealogical records that might go back many hundreds of years. Even in today’s westernized Korea many people can still recite the glorious history of their clans and take pride in them.