How did Prince Makhosetive become King Mswati III in 1986?

Following the death of King Sobhuza II in 1982, a regency was established to govern Eswatini until the heir, Prince Makhosetive, reached his 21st birthday. However, a power struggle within the royal family accelerated the transition.123

As a result, the prince ascended the throne at age 18, becoming the youngest world leader at that time. His coronation took place on April 25, 1986, at which point he took the name King Mswati III. Shortly after his coronation, he moved to consolidate his authority by dissolving the Liqoqo, a traditional advisory board that had become a powerful political force following his father's death.12