A large section of the walls in Wat Pho in Bangkok illustrate the Sri Lankan Theravāda Chronicle, the Mahāvaṁsa. The story is a long one, from the Buddha’s lifetime to around 1,000 years later in the original section of the story, written in the 5th century CE.
One of the major events during that period was the introduction of Buddhism by the Arahant Mahinda; and the introduction of the Bhikkhunī Sangha and the bringing of the national palladium, the Bodhi Tree, to Lanka by his sister, the Arahant Bhikkhunī Sanghamittā.
The latter events are found illustrated on the walls of Wat Pho. As is typical for the style of the paintings, stories are presented side by side, within the same space. The first photo below shows the whole scene: