Two original documents autographed by Abraham Lincoln, valued at $18.1 million, to be auctioned off by Sotheby's.

In a remarkable event that sent ripples through the world of collectibles, a Fine Books and Manuscripts auction held by Sotheby's in New York on June 30th, saw two historically significant documents, both signed by then-President Abraham Lincoln, fetch record-breaking prices.

The Thirteenth Amendment document, a crucial milestone in the abolition of slavery in the United States, was the star of the show. It sold for an astonishing $13.7 million, making it the most expensive document ever sold at auction. This sale also set a new auction record.

The Emancipation Proclamation, another significant document from Lincoln's presidency, also made headlines as it was sold for $4.4 million. This sale also set a new auction record, making it the second most expensive document ever sold at auction.

Both documents were purchased by Kenneth Griffin, the founder and CEO of Citadel. Griffin's acquisition of these rare and historically significant documents marks his continued investment in historical artifacts.

The auction included two documents of immense historical value. The Thirteenth Amendment document, which officially ended slavery in the United States, and the Emancipation Proclamation, which declared slaves in Confederate-held territory to be free, are both pivotal to understanding the history of civil rights in America.

While the buyer of these two rare and historically significant documents sold at Sotheby's Fine Books and Manuscripts auction on June 30 in New York is not publicly disclosed in the available search results, the total amount spent on them together is also not specified.

This auction marked a significant moment in the world of collectibles, with two of the most important documents in American history finding a new home, and setting two new auction records in the process.