From the National Parks website, including all the typos:

Unveiled by Prime Minister Goh Chok Tong, 1991. Interpretation : showcases the eight legendary Chinese heroes, deicting basic moral values of loyalty to country, filial piety, benevolence, love, courtesy, righteousness, honesty and modesty.

Lin Zexu (1785 - 1850 AD): A Ching Dynasty Imperial Inspector whose bold action against trading of opium started the Opium War.

Zheng He (1371 - 1435 AD) : A Ming Dynasty Admiral who was also a great envoy. He was responsible for establishing diplomatic and trading links with South East Asian countries.

Wen Tianxiang (1236 - 1283 AD) : A Song Dynasty Prime Minister who refused to surrender to his enemy when the nation was falling.

Yue Fei (1103 - 1142 AD): A Song Dynasty General who is well known for his loyalty to his nation.

Hua Mulan (386 - 436 AD) : A lady General who is well known as a filial daughter who served the army in place of her old and ailing father.

Guan Yu (160 - 219 AD) : A Three Kigndoms General who was righteous.

Qu Yuan (340 - 278 BC) : A Warring States scholar who committed suicide when his nation fell after the emperor failed to take his advice.

Confucius (551 - 479 BC): A well known Chinese philosopher.