floruit
verb uk/ˈflɔː.ru.ɪt/ us/ˈflɔːr.ju.ɪt/ (abbreviation fl.)
（拉丁文）在世期;全盛时期（尤用于生卒日期不明的人物）
used in writing before a date to show when a person lived or was active. It is Latin for "he or she flourished".
Albert of Aachen floruit circa AD 1100 亚琛的阿尔伯特（公元1100年左右在世）