In 1279 the Yuan commander
张弘范 carried the captive
文天祥 across the Lingding Sea, in the mouth of the Pearl River, and told him to write to the last Song loyalists urging them to surrender. He wrote this poem instead. It ends
人生自古谁无死,
留取丹心照汗青, 'since ancient times, who has not died? Let my loyal heart shine in the pages of history.'