John Lewis — an icon of the civil rights movement, congressman and for decades a force in Democratic politics — has died at age 80.

Lewis died after a battle with advanced-stage pancreatic cancer. Lewis began treatment for the disease after being diagnosed during a routine medical exam. Hepublicly disclosed his diagnosis in late December.

"The world has lost a legend; the civil rights movement has lost an icon," the Congressional Black Caucus said in a statement Friday evening.

"Some kind of fight"

Lewis began his nearly 60-year career in public service leading sit-ins at segregated lunch counters in the Jim Crow-era South. He elevated that fight for freedom and equality with a speech on the steps of the Lincoln Memorial at the 1963 March on Washington and tested his own resolve as he and other peaceful protesters were violently beaten in 1965 while crossing the Edmund Pettus Bridge in Selma, Ala.

Lewis called it a moral obligation to stand up for his beliefs. That drive for service motivated him to run for Congress, where he represented the Atlanta area in the U.S. House for more than 30 years. He continued to work after his diagnosis, pledging to face advanced-stage cancer the same way he met the other great challenges of his life: by refusing to back down.

"I have been in some kind of fight — for freedom, equality, basic human rights — for nearly my entire life. I have never faced a fight quite like the one I have now," Lewis said in a December statement announcing his diagnosis. "I have decided to do what I know to do and do what I have always done: I am going to fight it and keep fighting for the Beloved Community. We still have many bridges to cross."

Lewis was known throughout his career not only for his dedication to equality and justice but also for his unique and moving oratory. He was revered by his colleagues in Congress for his ability to capture a moment and inspire others to action, a skill he honed from his earliest days.

In a 2004 interview with the nonprofit Academy of Achievement, Lewis recalled how preaching to chickens on his family farm in Troy, Ala., prepared him for a life in Washington.

"I say now, when I look back on it, some of these chickens would bow their heads. Some of these chickens would shake their heads," Lewis laughed. "They never quite said 'Amen,' but they tended to listen to me much better than some of my colleagues listen to me today in the Congress, and some of those chickens were a little more productive. At least they produced eggs."

The foundation of faith that had him preaching in chicken coops also drew Lewis to the weekly radio sermons of Martin Luther King Jr. Lewis recalled in a 2009 interview with Fresh Air's Terry Gross that those early broadcasts helped inspire his future activism.

"I was so inspired by Dr. King that in 1956, with some of my brothers and sisters and first cousins — I was only 16 years old — we went down to the public library trying to check out some books, and we were told by the librarian that the library was for whites only and not for coloreds," Lewis said. "It was a public library."

He didn't set foot in that library again until 40 years later — to sign copies of his own memoir. He said the 1956 experience set him on a course toward the civil rights movement.

Lewis went on to study the techniques of nonviolent protest while attending what's now known as the American Baptist College in Nashville.

In the summer of 1961, he and other students protested at segregated lunch counters and later joined the famous Freedom Rides. By his early 20s, Lewis was head of the Student Nonviolent Coordinating Committee, and in 1963, he joined King as a speaker at the March on Washington.

He spoke on voting rights and the future of the Democratic Party. His speechwas brief, lasting less than eight minutes, but his words influenced a generation of activists.

"To those who have said, 'Be patient and wait,' " he said. "We must say that we must not be patient. We do not want our freedom gradually, but we want to be free now."

Lewis took action again two years later in 1965 in a march from Selma to Montgomery, Ala. In his interview with Fresh Air, Lewis remembered leading peaceful marchers onto the Edmund Pettus Bridge to protest voter registration. There, they met Alabama state troopers.

"In less than a minute and a half, the major said, 'Troopers advance,' " Lewis recalled. "And you saw these men putting on their gas masks. They came toward us beating us with bullwhips, nightsticks, [charging at] us with horses and releasing the tear gas. I was hit in the head by a state trooper with a nightstick. I thought I was going to die."

It came to be known as Bloody Sunday, and news images from that day were fresh in the minds of lawmakers as the seminal Voting Rights Act became law that same year.

"We changed that"

Later, Lewis would make an annual pilgrimage to the bridge to honor that day. The event became a rite of passage for Democrats running for office, particularly in 2007 when then-Sen. Barack Obama was vying to become the nation's first African American president.

The pair repeated that walk several times, and in 2011, Obama presented Lewis with the Presidential Medal of Freedom. In his speech, Obama said Lewis had been asking himself two questions his entire life: "If not us, then who? If not now, then when?"

"It's why, time and again, he faced down death so that all of us could share equally in the joys of life," Obama said. "It's why all these years later, he is known as the conscience of the United States Congress, still speaking his mind on issues of justice and equality."

Lewis told NPR the honor brought tears to his eyes.

"It's hard to believe that in a short time, that we have come so far as a nation and as a people," Lewis said. "When you look back, the year that Barack Obama was born 50 years ago, black people and white people in the American South couldn't sit together on a bus or on a train or in a waiting room. And we changed that."

Lewis became a national figure again in 1986 when he was elected to represent the Atlanta area in the House of Representatives. There, he pursued legislation on major Democratic priorities, including civil rights, health care and gun control.

"Where is our courage?"

He was known among lawmakers for his commanding voice and delivery that helped transform routine House floor speeches into calls to action. He used that skill to push fellow Democrats to speak up and cause what he called "good trouble."

This is what he did in 2016 following the mass shooting at Pulse Nightclub in Orlando, Fla.

On the morning of June 22, Lewis began a speech on the House floor, surrounded by more than a dozen of his fellow lawmakers.

"The time for silence and patience is long gone," he said. "We are calling on the leadership of the House to bring commonsense gun control legislation to the House floor, give us a vote. Where is the heart of this body, where is our soul? Where is our moral leadership? Where is our courage?"

It was the start of a two-day sit-in to demand votes on a series of gun control measures. Democrats remained on the House floor, even after Republican leaders closed the House session and cut off the ever-present C-SPAN video feed. Democrats stayed there for two days, ultimately failing to persuade Republicans to schedule the votes.

But the moment was a rallying cry for Democrats in the following years as clashes with Republicans increased after the election of Donald Trump.

Lewis publicly called Trump an illegitimate president before he even took office, citing Russian interference in the 2016 election. Lewis boycotted Trump's inauguration and was a forceful voice in the many House investigations into the Trump administration.

As the House prepared to vote to impeach Trump, Lewis compared the moment to other times when he chose to follow his sense of moral obligation.

"When you see something that is not right, not just, not fair, you have a moral obligation to say something, to do something," Lewis said on the House floor hours before the vote. "Our children and their children will ask us: 'What did you do? What did you say?' For some, this vote may be hard, but we have mission and a mandate to be on the right side of history."

Less than two weeks later, he announced his diagnosis of stage 4 pancreatic cancer. When it came to that final battle, Lewis returned to mantra he repeated on the steps of the Lincoln Memorial in 1963: Never stop fighting.

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