Qatar's former emir, Sheikh Khalifa bin Hamad Al Thani, died Sunday at the age of 84, more than 20 years after he was deposed by Sheikh Hamad bin Khalifa, the father of the emirate's current ruler.

Qatar has announced three days of mourning, according to Al-Jazeera . The death was announced by Qatar's royal court.

Sheikh Khalifa came to power in 1972, after seizing power from his cousin, Sheikh Ahmad bin Ali Al Thani. In 1995, he was himself deposed by his son, Sheikh Hamad, in 1995, while on a trip outside of the emirate. Sheikh Khalifa's grandson, Tamim bin Hamad Al Thani, is the current emir of Qatar, having taken power after Sheikh Hamad stepped down in 2013 .

After spending nearly 10 years in exile, Sheikh Khalifa returned to Qatar in 2004.