Spain: the lovers of Teruel. Google “amantes de Teruel” for nifty pics of the mausoleum. Yep, they’re real. Poor second son, rich noblewoman; her father gives him 5 years to come back with money. He comes back in time… to a festive town… which is celebrating his bride’s wedding! The father didn’t count too well. He goes to the cathedral, meets the bridal party as it comes out; asks her for a kiss, but she refuses: she still loves him, but now belongs to another. His heart breaks and he dies.
His funeral is the next day. As they pass the house of his beloved, a veiled woman exits its door. It’s her. She lifts her veil, kisses his coffin and drops dead on top of it.
Like I said, their double grave is gorgeous, some of the most delicate stonework I’ve ever seen.
Also the lovers in the Romance del Conde Niño, a poem that I absolutely love (and most poetry leaves me scratching my head) and wish I could translate but my English isn’t that good and anyway it’s pretty long: the Count is singing at the sea side, the Queen hears him and calls her daughter over “to hear the sirens sing”, “that’s no sirens, Mother, it’s the Count singing for me”, “for your love he sings? I’ll have him killed for his arrogance” “if you kill him, I will die”. He dies at midnight; she, with the sunrise. She is buried at the altar, he a few steps back. A rosebush grows from her grave, a white thornbush from his; those branches that met, hugged; those that could not hug, did not stop sighing. The Queen orders both shrubs cut, a crane was born from her, a strong hawk from him; together they fly forever, together across the sky
I didn’t say I had good taste 
The legend of El Cristo de La Vega in Toledo: he comes back after 7 years making his fortune as a soldier in Flandes… but doesn’t fulfill his promise of marriage to her, made in front of the Christ at the vegetable gardens, down by the river; she sues and claims the statue of Christ as her witness; the judges move the tribunal there and set out to question the statue. When asked, “do you swear that one day, in front of your feet, Diego swore that he would marry Inés?”, the statue lifts its right hand from the Cross and, touching the papers where the proceedings are being written as witnesses had to do, says “I do”. Both Inés and Diego get sudden attacks of religion and enter convents.
There’s several “leyendas de la Mora”: christian knight, taken prisoner, assisted by moorish lady, falls in love with her. There’s variations from that point but they never get to marry.
And several “beautiful Rebecas” (it’s almost a legend sub-gender). This one is from Cuenca: a christian young man, coming back from a walk in the forest, comes upon some toughs who are bothering a lady and scares them away. He offers to escort her home but she refuses. He follows anyway: partly out of curiosity, partly because he’s genuinely worried that the thoughs may come back. She enters a house in the Jewish part of town; he gets closer and sees that a Star of David decorates the door; it is indeed a Jewish house. Darn and damnation, oh well.
Because she’s arrived late and some people have seen the christian guy following her, she gets accused of, uhm, impropriety. She doesn’t know his name, not would she expect any help from a Christian; plus, if people aren’t even thinking of checking for virginity, what will his word help? He hears about it through the grapevine (he’d said “darn and damnation” but was still curious to know who she was) and figures out a way to help her; the two families become friends.