Syrians were set to commemorate the 14th anniversary of the popular uprising on Saturday in public demonstrations in Damascus and other cities for the first time since president Bashar al-Assad was toppled.

A demonstration will be held in Umayyad Square in the capital Damascus, the first after years of repression under Assad during which the square was the sole preserve of the toppled president's supporters.

Activists also called on people to gather in Homs, Idlib and Hama at demonstrations raising the slogan "Syria is victorious."

Qader al-Sayed, 35, told AFP that "we always used to protest on the anniversary of the revolution in Idlib, but today we will celebrate victory in the heart of Damascus."

"It's a dream come true," he said from the capital.

Syria's conflict began with peaceful demonstrations on March 15, 2011, in which thousands protested against Assad's government, before it spiraled into civil war after his violent repression of the protests.

This year's commemoration marks the first since Assad was toppled on Dec. 8 by a coalition of opposition forces in a sweeping 10-day lightening offensive.

Ahmed al-Sharaa, who headed the Islamist group Hayat Tahrir al-Sham which spearheaded the offensive, has since been named interim president.

On Thursday, Sharaa signed into force a constitutional declaration regulating a five-year transition period before a permanent constitution is to be put into place.

Analysts have criticised the declaration, saying it grants too much power to Sharaa and fails to provide sufficient protection to the country's minorities. 

It also came a week after Syria's Mediterranean coast, the heartland of Assad's Alawite minority, was gripped by the worst wave of violence since his overthrow.

According to the Syrian Observatory for Human Rights war monitor, security forces and allied groups killed at least 1,500 civilians, mainly Alawites, in the violence that erupted on March 6.

The United Nations's special envoy for Syria, Geir Pedersen, said on Friday: "It is fourteen years since Syrians took to the streets in peaceful protest, demanding dignity, freedom and a better future."

He added in a statement that despite the brutal civil war, "the resilience of Syrians and their pursuit of justice, dignity and peace endure. And they now deserve a transition that is worthy of this."

He called for "an immediate end to all violence and for protection of civilians."