Who were the most important architects of the 20th century?
The 20th century saw the emergence of several notable architects who have left an indelible mark on the field of architecture. Here are a few of the most important architects of the 20th century:

1. Frank Lloyd Wright - An American architect known for his organic architecture, Wright designed over 1000 structures during his career, including the iconic Fallingwater.

2. Le Corbusier - A Swiss-French architect, Le Corbusier was one of the pioneers of modern architecture, known for his use of clean lines and functionalism.

3. Ludwig Mies van der Rohe - A German-American architect, Mies van der Rohe was a pioneer of modern architecture and is known for his use of steel and glass in his designs.

4. Walter Gropius - A German architect and founder of the Bauhaus school, Gropius was a proponent of functionalism and the idea that design should serve a social purpose.

5. Louis Kahn - An American architect known for his monumental and often abstract designs, Kahn's work is characterized by its use of light and materials.

6. I.M. Pei - A Chinese-American architect, Pei designed some of the world's most iconic buildings, including the Louvre Pyramid in Paris and the Bank of China Tower in Hong Kong.

7. Zaha Hadid - A British-Iraqi architect, Hadid was the first woman to win the Pritzker Architecture Prize and was known for her innovative designs and use of fluid shapes.

These architects have all made significant contributions to the field of architecture and their work continues to inspire and influence new generations of architects.
Now how about a list of the most ecological, self sufficient and renewable architecture projects with mention of the great architects behind them.