April 21 in History – A Timeline of Remarkable Events | Past Tracker

From world-changing decisions to birth anniversaries, April 21 has a story to tell.


Past Tracker brings you Today in History – Explore top historical events, famous birthdays, notable deaths, and FAQs from this day.

What is special about the 21st of April?

April 21 marks a significant day in the historical timeline, highlighting revolutionary moments, wars and conflicts, historic inventions, and great leaders who shaped the world. From founding capitals to royal transitions, this day stands out in world history. Whether you’re a history enthusiast or just wondering “What happened on 21 April?”, dive into these handpicked April 21 events that echo across history archives.


Top 10 Historic Events – April 21


753 BC – The Founding of Rome

On April 21, 753 BC, according to legend, Romulus founded the city of Rome after a fierce dispute with his twin brother, Remus. This event marks the beginning of what would become the vast Roman Empire, influencing art, politics, language, and law for centuries. Rome's foundation is celebrated in Italy as a historical and cultural milestone. This day became the origin of many traditions and is still commemorated in Roman festivals. This event is a key reference in ancient history and is often cited as the birth of Western civilization.


1509 – Henry VIII Ascends to the English Throne

On this day in 1509, King Henry VIII became King of England following the death of his father, Henry VII. His reign would go on to change the course of English history, especially through the separation of the Church of England from the Roman Catholic Church. His policies and multiple marriages stirred religious reformations and political drama. This historic moment remains vital in both modern history and the history of monarchies worldwide.


1836 – Battle of San Jacinto Secures Texas Independence

On April 21, 1836, the Texan army led by General Sam Houston decisively defeated the Mexican forces of General Santa Anna at the Battle of San Jacinto. This victory led to the independence of Texas from Mexico. It’s remembered as a pivotal moment in American history, highlighting the spirit of rebellion, strategy, and determination. This revolutionary moment reshaped borders and added to the broader narrative of wars and conflicts in the Americas.


1918 – World War I: German Flying Ace Manfred von Richthofen Dies

Known as the Red Baron, Manfred von Richthofen, the most famous fighter pilot of WWI, was shot down and killed on April 21, 1918. He had 80 confirmed air combat victories. His death marked a significant loss for the German Air Force. The Red Baron remains a legendary figure in war history, symbolizing both the glory and the tragedy of world conflict. His legacy lives on in literature, games, and military history.


1926 – Queen Elizabeth II Is Born

On April 21, 1926, Elizabeth Alexandra Mary Windsor, later Queen Elizabeth II, was born in London. She became the longest-reigning monarch in British history. Her rule witnessed transformative decades—from the end of the British Empire to the rise of the Commonwealth. Her leadership style and dedication to duty made her a beloved global icon. April 21 is thus remembered in modern history for the birth of a great leader and symbol of peace and continuity.


1960 – Brasília Becomes the Capital of Brazil

April 21, 1960, saw the official inauguration of Brasília as Brazil’s new capital, replacing Rio de Janeiro. Designed by architect Oscar Niemeyer and urban planner Lúcio Costa, the city was envisioned as a modernist utopia and became a UNESCO World Heritage Site. This event symbolizes historic discoveries in urban planning and national development. Brasília's creation is a prime example of visionary thinking in history uncovered.


1975 – Vietnam War: Saigon Evacuation Begins

On this day in 1975, the U.S. began evacuating American citizens and South Vietnamese allies from Saigon as the North Vietnamese army closed in. Known as Operation Frequent Wind, it marked the end of the Vietnam War, a conflict that profoundly impacted global politics and society. The evacuation symbolized both loss and humanitarian effort, marking one of the final historic moments in Cold War-era conflicts.


1989 – Protests Begin in Tiananmen Square, China

April 21, 1989, marked the beginning of massive student-led protests in Tiananmen Square, Beijing, calling for democratic reforms. These demonstrations sparked global attention and later culminated in a tragic crackdown. This day serves as a haunting reminder of freedom movements, government resistance, and the power of civil action in modern history. It continues to inspire movements for human rights around the world.


1994 – Civil War Ends in Rwanda

On April 21, 1994, amid the Rwandan genocide, the United Nations intensified efforts to respond to the humanitarian crisis. Though late, the global response marked the beginning of healing and reconstruction in Rwanda. The genocide, which killed nearly 800,000 people, remains one of the darkest chapters in recent history. April 21 serves as a reflection point for world peace, justice, and human dignity.


2020 – Oil Prices Turn Negative for First Time in History

On April 21, 2020, U.S. oil prices plunged below zero for the first time ever due to oversupply and decreased demand during the COVID-19 pandemic. This historic event shocked global markets and marked a significant moment in economic history. It reflected the interconnectedness of energy, environment, and economics, and highlighted the fragility of global supply chains during crises.


April 21 Famous Birthdays

  • Queen Elizabeth II (1926–2022): Longest-reigning British monarch.

  • Tony Danza (1951): American actor, known for "Taxi" and "Who's the Boss?"

  • Iggy Pop (1947): Iconic punk rock singer and frontman of The Stooges.

  • James McAvoy (1979): Scottish actor best known for roles in X-Men and Split.

These personalities contributed to culture, leadership, and entertainment, leaving a mark on history matters.


Notable Deaths on April 21

  • Mark Twain (1910): American author of The Adventures of Tom Sawyer and Huckleberry Finn.

  • Manfred von Richthofen (1918): The Red Baron, WWI ace pilot.

  • Nina Simone (2003): American singer and civil rights activist.

These figures reflect legacy today, echoing through the ages in music, literature, and war and peace.


April 21 Zodiac: Aries or Taurus?

People born on April 21 fall under the Taurus zodiac sign. Taurus is known for traits such as reliability, patience, and strong will. It's an earth sign, ruled by Venus, and associated with beauty, love, and comfort. Those born on this date tend to value loyalty and perseverance.


April 21 Holiday – Is April 21 a Special Day?

Yes, April 21 is recognized as:

  • Tiradentes Day in Brazil – a public holiday honoring a national martyr.

  • Rome’s Birthday – celebrating the legendary founding of the city.

  • San Jacinto Day in Texas – marking the victory in the Battle of San Jacinto.

In 2025, April 21 holiday 2025 falls on a Monday, making it a long weekend in some regions. For many, it’s a day of remembrance and celebration, making it one of the most special days in April.


Conclusion: Why April 21 Matters in History

From the ancient founding of Rome to modern geopolitical shifts, April 21 has played host to historic moments daily that shaped nations, empires, and the global order. It reminds us that history unfolded on all fronts—military, political, cultural, and personal. Whether you’re reflecting on the past to present or exploring forgotten history, April 21 offers rich insights.


FAQs


What is special about the 21st of April?

April 21 is known for Rome’s founding, Queen Elizabeth II’s birth, and key war events like the Battle of San Jacinto and the Red Baron’s death.

What happened on April 21?

Significant events include the founding of Rome (753 BC), Queen Elizabeth II’s birth (1926), and oil prices turning negative (2020).

What is the zodiac for April 21?

April 21 falls under the Taurus zodiac sign.

Is April 21st Aries or Taurus?

April 21 is generally considered Taurus, though on a cusp with Aries.

What holiday is on April 21?

April 21 celebrates Rome’s birthday, San Jacinto Day (Texas), and Tiradentes Day (Brazil).

What days in April are special?

Other than April 21, April 1 (April Fool’s), April 22 (Earth Day), and April 15 (Tax Day US) are also notable.

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