Detailed Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Q: MINNEAPOLIS (AP) — Researchers believe they found the grave of a man who could be considered the first black male slave freed by Abraham Lincoln, tracking his final resting place to the cemetery of a former Minnesota psychiatric hospital. 
  
 This photo taken on June 17, 2015, photo, shows Rochester State Hospital Cemetery in Rochester, Minn. The likely grave of a man considered the first black male slave freed by Abraham Lincoln lay unnoticed... (Associated Press) 
  
 In this June 17, 2015, photo, the grave of a man considered the first black male slave freed by Abraham Lincoln is shown at the Rochester State Hospital Cemetery in Rochester, Minn. William Henry Costley... (Associated Press) 
  
 William Henry Costley was just 10 months old in 1841 when Lincoln, who was still a young lawyer, won an Illinois Supreme Court case freeing Costley's mother from indentured servitude — a status that historians say would have been akin to enslavement for the black woman and child at that time. That was 22 years before Lincoln, as president, issued the Emancipation Proclamation, declaring slaves in rebel states not under Union control free. 
  
 Nance Legins-Costley and her son William were from Pekin, a central Illinois community about 130 miles southwest of Chicago, which is what drew the interest of a local amateur historian, Carl Adams. Adams, who now lives in Stuttgart, Germany, spent years researching her and her children's lives . Last year he published "Nance: Trials of the First Slave Freed by Abraham Lincoln — A True Story of Nance Legins-Costley." 
  
 In his book, Adams writes that after winning her lengthy legal battle for freedom, Legins-Costley, who had been born to slaves and sold twice before Lincoln took up her cause, lived to a ripe old age in Pekin. Military records helped Adams retrace her son's steps, but finding his gravesite required the help of a curator at the Abraham Lincoln Presidential Library and Museum in Springfield, Illinois, and a historical researcher in Minnesota. 
  
 "We are 99.9 percent certain that this is William H. Costley," Adams said of the gravesite. 
  
 William Costley enlisted as a private in the 29th Regiment of U.S. Colored Troops from Illinois in 1864, three years after the Civil War started following the election of Lincoln as president. 
  
 Costley was wounded during the war, and after Confederate General Robert E. Lee surrendered in April 1865, Costley's regiment was dispatched to Galveston, Texas. Adams said he may have witnessed Gen. Gordon Granger's June 19, 1865, declaration there that the state's 250,000 slaves were now free. That date is now celebrated as the holiday Juneteenth. 
  
 In 1870, an all-white jury acquitted Costley of murder in the fatal shooting of a man considered disreputable in the community. Costley's defense was that he killed him while protecting a woman. 
  
 Costley moved to Iowa and later to Minnesota, where his health declined. A war wound, a head injury he suffered as a teenager and a case of sunstroke in 1887 eventually left him an invalid. He died in Minnesota in 1888, Adams said. 
  
 Adams said Costley's pension records show that he had been sent to an insane asylum in Rochester, but he couldn't determine where he had been buried so he enlisted the help of Rich Arpi, a staffer with the Ramsey County Historical Society who also does independent research. Arpi found the Rochester State Hospital's records for a black patient named "William H. Crossley," whose grave was marked by a number at the institution's cemetery in what's now a city park until it was replaced recently by a "Crossley" headstone. 
  
 Besides spellings that varied even within the pension and hospital records, there were other discrepancies that Adams needed to clear up. The dates of death were slightly different — Oct. 1 in the hospital records, Oct. 2 in the pension records. But the birth years were five years off. The researchers eventually concluded it had to be Costley's grave. Adams said Costley was illiterate, and may have been incoherent when admitted, so the spelling apparently just got jumbled along the way. 
  
 "I think it is so likely that it's nearly a sure thing," said James Cornelius, curator of the Lincoln Collection at the Lincoln Library and Museum, who consulted with Adams. 
  
 Cornelius said Adams has done a remarkable job of pulling together the history of Costley and his family and resolving the discrepancies to locate his grave given that "vanishingly few records" exist on most people who lived on the margins of society because they were slaves, poor or illiterate, as Costley was. ||||| Every american knows lincoln freed the slaves. 
  
 But did you know that before he freed all the slaves, he freed just one slave? 
  
  
  
 Her name was Nance, and this children's book is the story of that brave girl who sued for her freedom, and won. 
  
 Based on decades of painstaking research into court records, this book is the true story of the three Supreme Court trials of the first slave freed by a then-young lawyer, Abraham Lincoln, in Illinois in 1841. 
  
  
  
 In 2009, the Editor of the Illinois History Journal called this body of research "the only story of Lincoln that is really new." Nance actively tried to free herself through legal means on several occasions, but it was only when she and Lincoln worked together that they both won. Her struggles began as a when she was just a girl, and lasted over 15 years. |||||
A:
Abraham Lincoln helped free a black male slave long before the Civil War, and researchers say they've found the man's grave—in a former psychiatric hospital's cemetery, the AP reports. A budding lawyer, Lincoln won a case before the Illinois Supreme Court in 1841 that released Nance Legins-Costley from indentured servitude, which historians say amounted to slavery for a black woman. Legins-Costley walked away with her 10-month-old son, William Henry Costley, and lived to a ripe old age in her central Illinois hometown of Pekin. But what became of the first black male slave freed by Lincoln? An amateur historian named Carl Adams spent years investigating the story and published a book about Legins-Costley last year, Nance: Trials of the First Slave Freed by Abraham Lincoln—A True Story of Nance Legins-Costley. The editor of a history journal says Nance tells "the only story of Lincoln that is really new," according to a site dedicated to the book. Costley apparently enlisted in a colored-troops regiment from Illinois in 1864, was wounded in the war, and found himself dispatched in Galveston, Texas. A few years later, an all-white jury found him not guilty in the shooting death of a man considered disreputable; Costley said he was protecting a woman when he pulled the trigger. Eventually, Costley moved to Minnesota, became an invalid, and lived in a psychiatric hospital in Rochester. There, Adams says, lies a grave that matches a number from hospital records as Costley's. It also recently received a "Costley" headstone. "I think it is so likely that it's nearly a sure thing," says a Lincoln expert. (Read about a black slave whose story was rewritten, 150 years later.)