Dairi in Heian-kyo frequently burnt down; residences of the retainers, including Sekkan (regents and advisers), and the maternal relatives were often taken up as the temporary Kokyo (Satodairi).
平安京の内裏はしばしば焼亡したため、摂関や外戚など臣下の邸宅を仮皇居（里内裏）とすることも多かった。