The phrase 'accordance with the painting of four beasts' here means Shijin-so-o topography, which confirms that during the Nara period Heijo-kyo was considered to be the place having Shijin-so-o topography.
この「四禽図に叶ひ」とは四神相応のことであり、奈良時代には平城京が四神相応の地であると考えられていたことを確認できる。