More than 500 years ago, tens of thousands of Jews fled Spain because of persecution. Now their descendants are being invited to return.
Before the infamous Spanish Inquisition of the 15th Century, some 300,000 Jews lived in Spain. It was one of the largest communities of Jews in the world.
Today, there are about 40,000 or 50,000 - but that number could be about to swell dramatically.
In November, Spain's justice minister Alberto Ruiz-Gallardon announced a plan to give descendants of Spain's original Jewish community - known as Sephardic Jews - a fast-track to a Spanish passport and Spanish citizenship.
"In the long journey Spain has undertaken to rediscover a part of itself, few occasions are as moving as today," he said.
Anyone who could prove their Spanish Jewish origins, he said, would be given Spanish nationality.
The news spread like wildfire among Sephardic Jews around the world.
According to the Spanish Federation of Jewish Communities, which processes the applications, there were about 6,000 enquiries in the first month alone - including one from an unnamed member of the US Congress.
"My initial reaction was that this was a really thrilling moment - that it was an act of justice," says Doreen Carvajal, a US citizen and reporter with the New York Times in Paris.
"It was a romantic notion on my part. I told my husband, 'I think I'm going to try and get the passport because it closes a circle'. It was very poetic."
Carvajal was brought up Catholic, but a few years ago, she discovered she has Sephardic Jewish roots.
She began to investigate, eventually tracing her family tree back to the 15th Century and the city of Segovia, north of Madrid. She has countless documents, and has detailed her story in a book, The Forgetting River: A modern tale of survival, identity and the Inquisition.
But Carvajal says that when she contacted the Spanish Federation of Jewish Communities, she learned that she didn't qualify. Not yet, anyway.
Carvajal's family was among the estimated one-third of Spanish Jews who converted to Catholicism to escape the Inquisition's clutches. They were known as the "conversos".
So, Carvajal is technically the descendant of converts. She's not a practising Jew herself. She was told she would have to convert back to Judaism before she could get Spanish citizenship.
"It felt like another act of being forced. Here are these people, the descendants of the forced ones, the conversos, being told you have to do this, you have to be a certain religion. So what happens if you're a secular Jew?"
The fast-track procedure has not yet taken effect - and Carvajal may well be entitled to citizenship when the rules are finalised.
The secretary general of the Spanish Federation of Jewish Communities, Mauricio Toledano, told the BBC that the government is still working on details of the scheme, and when the new law is presented to parliament, it's expected to specifically state that all descendants of Sephardic origin - whether they are Jewish or not - be given citizenship.
In total, about 100,000 Jews fled Spain in the course of the 15th Century. Some went to North Africa, but most settled in the economic powerhouse of the day, the Ottoman Empire - which then stretched from Hungary to Turkey, and beyond that to the south, and was expanding.
About 90% of Jews in modern-day Turkey are Sephardic Jews. Roni Rodrigue, 55, a car dealer in Istanbul, has already claimed his Spanish passport.
"I just thought I have a right to apply for citizenship, so why not."
He did this four years ago, under a pre-existing scheme, and got his papers in 11 months - though some of his friends have been waiting years.
Rodrigue has no plans to move to Spain, and has only been there twice, but says he still feels a connection.
He's a speaker of a dying language, Ladino. It's specific to Sephardic Jews and based on old Spanish, with words borrowed from Hebrew and the many countries in which they have settled since.
Rodrigue's parents spoke Ladino to each other but it has not been passed on to his children, or to most of the new generation of Sephardic Jews around the world.
It's not uncommon, though, for Sephardic Jews to feel the pull of Spain.
"I'm still Spanish in my soul and in my heart," says one British Sephardic Jew, who asked not to be named.
He's building a house in Spain, has bought land, and even a plot in which to be buried.
Like Carvajal, he's been left disappointed by the existing rules for acquiring citizenship, and stands to benefit from the new system.
He successfully went through the process to gain Spanish citizenship some time ago, but says he withdrew his application at the very end, when he discovered he would have to give up his British passport to complete the process - something he was not prepared to do.
The proposed new law, if passed, is expected to allow all new citizens of Sephardic origin to keep their existing passports.
It is well known that when Spain expelled the Jews in 1492 it had a disastrous effect on the economy - many were wealthy textile traders, jewellers and bankers.
"At the time of the Ottoman Empire, the Sultan was said to have commented that he couldn't understand why a great Spanish king like Ferdinand would go without the Jews - who were such a source of wealth - and just give them to him," says Maria Josep Estanyol, a historian at the University of Barcelona.
"The Sultan was very pleased to receive these Jewish families, who went on to enrich his empire."
For decades, there has been a movement to allow Sephardic Jews to return, but it is unclear why the Spanish government has chosen to bring up the issue again now.
In theory, enticing them back now could give a boost to Spain's shrinking economy, although Estanyol doubts very many will re-establish roots in Spain.
"Given how disastrous things are here today, I'd advise against it," she says.
It has also been suggested that Spain made the offer to mollify Israel, after Madrid supported last year's successful Palestinian bid for a seat at the United Nations.
Whatever the motivation, some Muslim scholars are denouncing the offer as unfair. They point out that their ancestors were expelled from Spain during the Inquisition. But no-one is inviting them back.