source: Roof tiles during Tang Dynasty with this symbol have been found west of the ancient city of Chang' an or modern-day Xian
target: Roof tiles used during the dynasty of Tang were recovered from the west of ancient city of Chang 'an . They carried this symbol . The city Chang 'an nowadays known as Xian.
references: Roof tiles used during the dynasty of Tang were recovered from the west of ancient city of Chang 'an . They carried this symbol . The city Chang 'an nowadays known as Xian. Roof tiles dating back to the Tang Dynasty with this marking have been found west of the ancient city of Chang 'an (present day Xian). Roof tiles date back to the Tang Dynasty with this symbol which was found west of the ancient city of Chang 'an. Roof tiles dating back to the Tang Dynasty with this symbol have been found west of the ancient city of Chang' an (modern-day Xian). roofing tiles used before the tang dynasty with this symbol is found in western parts of ancient chang 'an (modern-day xian ) Roof tiles of the time of the Tang Dynasty with this symbol have been found west of the old city of Chang' an (modern-day Xian). Roof tiles dating back to the Tang Dynasty with this sign have been found west of the old city of Chang' an which today is called Xian.