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Students and anti-government protesters attend a rally at Democracy Monument on August 16, 2020 in Bangkok, Thailand.

Bangkok, Thailand (CNN)It was an act unthinkable in Thailand mere months ago -- an estimated 10,000 anti-government protesters packing Bangkok's Democracy Monument on Sunday, with some calling for reform of the country's monarchy.

The protest was the biggest anti-government rally since the military seized power six years ago, and came after a month of almost daily demonstrations started by students across the country that have since attracted a large cross-section of society.

Anger among disaffected youth has been bubbling since before the March 2019 elections, which gave General-turned-Prime Minister Prayut Chan-o-cha another four years in office. But on Sunday, young and old were seen calling for democratic reforms, changes to the military-written constitution, and for the dissolution of parliament.