The tradition of Ash Wednesday marks the first day of the Christian period of Lent, a time of reflection, fasting, and prayer lasting 40 days.
During Ash Wednesday ceremonies, ash is placed on the heads of worshippers, often marked with a visible cross.
Words uttered to mark the occasion are based on Genesis 3:19: "Remember that you are dust, and to dust you shall return."
But how much do you know about Ash Wednesday? Test your knowledge with our quick quiz...