52 AC - 59 AC

When King Chandramukha Siva went to the Tissa Tank to enjoy water sports, he was killed by Prince Yasalalakatissa, who then seized the throne. This prince was the king’s own brother.
The author of the Mahavamsa seems to have had nothing noteworthy to say about this king. The chronicle simply states:
“He ruled the beautiful and prosperous Anuradhapura — a city like the face of the earth itself — for seven years and six months.”
Thus, the Mahavamsa describes the city rather than the king himself. No other historical record mentions any significant deed performed by King Yasalalakatissa. However, in the Ipul Vihara Inscription, it is recorded that he donated a reservoir to the Mulavosiya Vihara, which had been constructed by his father. In that inscription, he is referred to as Mahanagarahaputa Tisamabha Raja.
Although little is known about his governance, a curious and somewhat humorous story related to him is preserved in the chronicles.
Yasalalakatissa had a gatekeeper named Datta, who had a son named Subha. Subha also served as a gatekeeper and bore a striking resemblance to the king. One day, the king, for amusement, dressed Subha in royal garments, seated him upon the throne, and himself stood nearby dressed as a gatekeeper. When the ministers and courtiers arrived, they mistook Subha for the king and bowed before him. Amused, the king smiled.
Seizing the opportunity, Subha declared, “This gatekeeper dares to laugh in the presence of the king!” and immediately ordered that the real king be executed. Thus, King Yasalalakatissa was killed by his own gatekeeper.
Although this story in the Mahavamsa appears like a jest, it recounts a serious incident that led to the death of a monarch. Professor Senerath Paranavitana offers an analysis of this episode, explaining that while the king’s disguise as a gatekeeper is presented as a joke, similar customs existed in ancient royal ceremonies. For instance, when King Devanampiyatissa received the Bodhi tree, he entrusted the protection of the kingdom to eighteen clans and personally stood guard over the Bodhi tree disguised as a gatekeeper. Therefore, Professor Paranavitana suggests that Yasalalakatissa may have been following this ancient royal custom, and the incident might have occurred during such a ceremonial event.
If Subha had no supporters within the palace, it would have been impossible for him to kill the real king and ascend the throne. Hence, it is possible that he took the kingship and even presided over the royal council afterward. There appears to have been no resistance or protest against Subha’s actions, for no evidence of such opposition has been found. From the Mahavamsa narrative, it seems that the chronicler treated this as a rather ordinary occurrence.
It is also uncertain whether King Yasalalakatissa was tormented by remorse for having earlier slain his own brother, King Chandramukha Siva. If he indeed carried such guilt, perhaps some palace conspiracy emerged, and Subha’s act was merely the outward manifestation of a deeper plot.
The Dipavamsa, however, makes no mention of this peculiar and tragic episode recorded in the Mahavamsa.