Warrior Emperor(Zhao KuangYin)/Captive Poet Prince(LiYu) circa late-10th century - welcome to Chinese history RPF
Tai-Ping-Nian (Aka From Swords to Plowshares aka The Year for Peace) due to clear bias against Southern Tang featured them having about 10 minutes of screentime together. However, their OTPness comes through shining like a strange and slashy beacon so I went digging through the canon (history) which described a 15 year long relationship (almost Liyu's entire adult life) with all plot elements of an unrequited tragic story romance.
Warrior Emperor (Zhao Kuangyin), known for being first Emperor of Song Dynasty (unified the Chinese parts) and martial prowess. He grew up in an era in the Central Plains where decency and rule of law had been abandoned in favor of brutality and violence (cannibalism was economic reality). Distinguished for having ambition with a mind toward a civilized legacy, he was the first emperor in a long line of emperors who did not indulge in massacres (though they still happened), but was probably killed by his favorite younger brother.
Poet Prince (Li Yu), known for his beautiful devastating verses which are required text in Chinese language textbooks (for comparison: this is essentially Beowulf in terms of timeline). He was a gentle artistic ruler of the Southern Tang (Lord of Jiangnan) who wrote of music, wine, and dancing prior to his captivity. He also secretly trained a navy and actually held out for a year against the Song armies before surrendering. When he was taken North to the Song capital, his people wept.
They were penpals for 14+ years (Poet Prince is about 10 years younger than Warrior Emperor and keep refusing invite to head north for an actual meetup); some of these letters have survived
Though the army's already heading south Emperor actually retreated briefly because Poet Prince wrote a sad letter comparing himself to a small bird needing pity
Otherwise extremely frugal and caring of laborers, Emperor ordered icebreaking a lake so Prince and his household can journey safely North as soon as possible (he also ordered not to harm anyone from the royal family in the war)
Emperor also went against tradition of a formal surrender where the Enemy Ruler would be kneeling in public while wearing equivalent of underwear/naked; every OTHER ruler Emperor conquered by had to do it, but not Liyu (they put it in the show because apparently showrunners want Southern Tang as ..villains?)
Built Poet Prince a manor next to the palace in the Southern Style for his captivity where he can meet whomever he likes, just not leave the capitol
Emperor blamed Prince's Southern Tang courtiers for ...everything(resisting him and refusing to meetup)....many were banished to remote offices. Poet Prince get titles and and incomes.
Emperor BURIED with a calligraphy collection (rare personal item) that LiYu collected/edited
After Warrior Emperor died after mysterious circumstances within a year of Prince surrendering, Poet Prince wrote his most famous verses about his own homeland and wanting to go home.. (then he died within a year, age 40)
The later literati of the Song Dynasty compared LiYu to a flower forcefully plucked by the Emperor.
However you interpret the relationship, Kuangyin had a special place in his heart for Liyu. As for LiYu, we know that was comfortable enough to ask for wine and that none of his most famous works, if any, about missing home survived from the period when Emperor was alive. There have been some dubious TV shows on them since the 1980s, some more..telling..than others.
In short, after a long hiatus on historical RPFs (alas my ancient Romans), I'm finally writing again, even if I will be the only English ficcer for this pairing.