List the famous contemporaries of Zhao Kuan-ying.

Princess Olga and Svyatoslav of Kiev; emperors Otto1 Nicephorus II Phocas and John Tzimiskes | the poet Ferdowsi; the French king Hugo Capet; Minister Fujiwara Michinaga in Japan; Yeluy Ambagan and Yeluy Deguan are the rulers of the Khitan.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.