After the decline of Suzaku-oji Street Nijo-oji Street became the city's main street, and three Shoguns, from Takauji ASHIKAGA to Yoshimitsu, built their mansions there; these mansions were called either Nijo-jin (Nijo-jo Camp or Military Base) or Nijo-jo Castle.
当時の二条大路は朱雀大路が廃れた後、都一の大路であり、足利尊氏から義満まで3代の将軍が二条に屋敷を構えたため、将軍家の屋敷を二条陣または二条城といった。