It was a meeting that would live in history.

Cristobal Colўn was the European who had created the Carib League, a confederation of Christian tribes in all the lands surrounding the Carib Sea on the east, the north, and the south.

Yax was the Zapotec king who, building on his father's work in uniting all the Zapotec tribes and forming an alliance with the Tarascan Empire, conquered the Aztecs and brought his ironworking and shipbuilding kingdom to the highest cultural level achieved in the western hemisphere.

Their achievements were remarkably parallel. Both men had put a stop to the ubiquitous practice of human sacrifice in the lands they governed. Both men had adopted a form of Christianity, which was easily united when they met. Colўn and his men had taught European navigation and some shipbuilding techniques to the Tainos and, when they were converted to Christianity, the Caribs as well; under Yax, Zapotec ships traded far and wide, along both coasts of the Zapotec Empire. While the Carib islands were too poor in iron for them to match the achievements of the Tarascan metalsmiths, when Colўn and Yax united their empires into one nation, there were still enough of Colўn's European crew who knew ironworking that they were able to help the Tarascans make the leap forward into gunsmithing.

Historians looked back on their meeting at Chichen Itza as the greatest moment of reconciliation in history. Imagine what would have happened if Alexander, instead of conquering the Persians, had united with them. If the Romans and Parthians had become a single nation. If the Christians and Muslims, if the Mongols and the Han ...

But it was unimaginable. The only reason they could believe it was possible with the Carib League and the Zapotec Empire was that it actually happened.

In the great central plaza of Chichen Itza, where once human sacrifice and torture had been offered to Mayan gods, the Christian Colўn embraced the heathen Yax, and then baptized him. Colўn presented his daughter and heir, Beatrice Tagiri Colўn, and Yax presented his son and heir, Ya-Hunahpu Ipoxtli. They were married on the spot, whereupon both Colўn and Yax abdicated in favor of their children. Of course they would both remain the powers behind the throne until their deaths, but the alliance held, and the nation known as Caribia was born.

It was a well-governed empire. While all the different tribes and language-groups that were included within it were allowed to govern themselves, a series of uniform laws were imposed and impartially enforced, allowing trade and free movement through every part of Caribia. Christianity was not established as a state religion, but the principles of nonviolence and communal control of land were made uniform, and human sacrifice and slavery were strictly forbidden. It was because of this that historians dated the beginning of the humanist era from the date of that meeting between Yax and Colўn: the summer solstice of the year 1519, by the Christian reckoning.

The European influence that came through Colўn was powerful, considering that only he and the merest handful of his officers and men were available to promulgate their culture. But, having come to Haiti, a land without writing, it should not have been astonishing that the Spanish alphabet was adopted to write the Taino and Carib languages, or that Spanish should eventually be adopted as the language of trade, government, and record-keeping throughout the Carib League. After all, Spanish was the language that already had the vocabulary to deal with Christianity, trade, and law. Yet by no means was this a European conquest. It was the Spanish who gave up the idea of personal ownership of land, which had long been a cause of great inequities in the old world; it was the Spanish who learned to tolerate different religions and cultures and languages without trying to enforce uniformity. When the behavior of the Colўn's Spanish expedition in the new world is compared to the record of intolerance marked by the Inquisition, the expulsion of the Jews, and the war against the Moors in Spain itself, it is obvious that while Spanish culture provided a few useful tools -- a lingua franca, an alphabet, a calendar -- it was the Tainos who taught the Spanish what it meant to be Christian.

There was another similarity between Yax and Colўn. Each of them had an enigmatic adviser. It was said that Yax's mentor, One-Hunahpu, came direct from Xibalba itself, and commanded the Zapotecs to end human sacrifice and to look for a sacrificial god that they later believed was Jesus Christ. Colўn's mentor was his wife, a woman so dark she was said to be African, though of course that could not have been true. The woman was called Sees-in-the-Dark by the Taino, but Colўn -- and history -- came to know her as Diko, though the meaning of that name, if it had one, was lost. Her role was not as clear to historians as that of One-Hunahpu, but it was known that when Colўn fled the mutineers, it was Diko who took him in, nursed him back to health, and by embracing Christianity helped him to begin his great work of conversion among the people of the Carib Sea. Some historians speculated that it was Diko who tamed the brutality of the Spanish Christians. But Colўn himself was such a powerful figure that it was hard for historians to get a clear look at anyone in his shadow.

On that day in 1519, when the official ceremonies were over, as the feasting and dancing for the wedding of the two kingdoms ran far into the night, there was another meeting, one that was not witnessed by anyone but the participants. They met on the top of the great pyramid of Chichen Itza, the last hour before dawn.

She was there first, waiting for him in the darkness. When he came to the top of the tower and saw her, at first he was wordless, and so was she. They sat across from each other. She had brought mats so they wouldn't have to sit on the hard stone. He had brought a little food and drink, which he shared. They ate in silence, but the true feast was in the way they looked at each other.

Finally she broke the silence. "You succeeded better than we dreamed, Hunahpu."

"And you, Diko."

She shook her head. "No, it wasn't hard after all. He changed himself. The Interveners chose well, when they made him their tool."

"And is that what we made him? Our tool?"

"No, Hunahpu. I made him my husband. We have seven children. Our daughter is Queen of Caribia. It's been a good life. And your wife, Xoc. She seems a loving, gentle woman."

"She is. And strong." He smiled. "The third strongest woman I ever knew."

Suddenly tears flowed down Diko's face. "Oh, Hunahpu, I miss my mother so much."

"I miss her too. I still see her sometimes in my dreams, reaching up to pull down the switch."

She reached out her hand, laid it on his knee. "Hunahpu, did you forget that once we loved each other?"

"Not for a day. Not for an hour."

"I always thought: Hunahpu will be proud of me for doing this. Was that disloyal of me? To look forward to the day when I could show you my work?"

"Who else but you would understand what I achieved? Who else but me could know how far beyond our dreams you succeeded?"

"We changed the world," she said.

"For now, anyway," said Hunahpu. "They can still find their own ways to make all the old mistakes."

She shrugged.

"Did you tell him?" asked Hunahpu. "About who we are, and where we came from?"

"As much as he could understand. He knows that I'm not an angel, anyway. And he knows that there was another version of history, in which Spain destroyed the Caribian people. He wept for days, once he understood."

Hunahpu nodded. "I tried to tell Xoc, but to her there was little difference between Xibalba and Pastwatch. Call them gods or call them researchers, she didn't see much practical difference. And you know, I can't think of a significant difference, either."