Sir Winston Churchill was a great historian and statesman. The great leadership skills that he exhibited during wars, has secured him prime place in the British history. He is the best example of how you can overcome shortcomings and acquire a unique place in everyone's heart.
Martin Luther King, Jr. of USA is another best leader the world has seen. He was a strong supporter of civil rights. He led the first Negro nonviolent demonstration. The bus boycott lasted for 382 days but finally the Supreme Court of United States declared the segregation of Negroes on buses as unconstitutional.
Abraham Lincoln is remembered for his leadership in preservation of Union during the Civil War. He is mainly remembered for the beginning of the struggle to demolish the atrocious slavery in United States.
Mahatma Gandhi was a simple man, who made extraordinary efforts to support India's freedom struggle. Mahatma Gandhi helped India to get freedom from British rule. He achieved this goal with his ingenious leadership style know popularly know as non-violence resistance.
Margaret Thatcher has also shown very good leadership qualities She was prime minister of UK. She was the first woman who ever became prime minister of UK. She was also the longest serving PM in UK. As a leader she played an elemental role in Irish Hunger strike.