As a result of the importance of surnames, rules and traditions regarding family and marriage grew increasingly complex. For example, in Taiwan, there is a clan with the so-called "double Liao" surname. The story is that "Chang Yuan-zih of Liao's in Siluo married the only daughter of Liao San-Jiou-Lang who had no son, and he took the oath that he should be in the name of Liao when alive and should be in the name of Chang after death." In some places, there are additional taboos against marriage between people of the same surname, considered to be closely related. Conversely, in some areas, there are different clans with the same surname which are not considered to be related, but even in these cases surname exogamy is generally practiced.