Mohammed ibn Gao
Mansa Mohammed ibn Gao was mansa of the Mali Empire from 1305 to 1310.
Mansa Mohammed ibn Gao, as his name suggests, was the son of his predecessor, Mansa Gao.
He inherited the throne following his father's death in 1305 and ruled until being succeeded by his uncle, Abubakari II in 1310.
Sandaki (mansa)
Mansa Sandaki or Sandaki Mari Djata, also known as Sandiki or Santigi, was a mansa of the Mali Empire from 1389 to 1390.
Maghan III
Maghan III, also known as Mahmud I, was mansa of the Mali Empire from 1390 to about 1400.
He assumed the throne following the usurper Sandaki, who ruled for only two years.
Gao (mansa)
Gao was Mansa of the Mali Empire from 1300 to 1305.
Mansa Gao was one of two sons of Kolonkan.
Kolonkan was a sister of the legendary founder Sundiata Keita.
The mansa assumed the throne following the murder of the usurper Sakura on his return from the hajj.
He ruled until 1305, when he was succeeded by his son Mohammed ibn Gao.
Olof Mark
Knut Olof Mark (January 13, 1873 – May 15, 1920) was a Swedish sailor who competed in the 1912 Summer Olympics.
In 1912 he was part of the Swedish boat "Sass" which finished fourth in the 6 metre class competition.
Abu Bakr II
Abu Bakr II( fl. 14th century), also spelled Abubakri and known as Mansa Qu, may have been the ninth mansa of the Mali Empire.
He succeeded his nephew Mansa Mohammed ibn Gao and preceded Mansa Musa.
Abu Bakr II abdicated his throne in order to explore" the limits of the ocean".
Musa II of Mali
Musa II was mansa of the Mali Empire from 1374 to 1387.
Musa II took the throne following the death of his father, Mansa Mari Diata II.
He was succeeded by his brother Maghan II.
Kassa (mansa)
Mansa Camba, also known as Mansa Kassa, briefly acted as mansa of the Mali Empire in 1360.
Nephew of the powerful Mansa Kankan Musa I and son of Mansa Suleyman and his principal wife Kassi, Kassa assumed the throne following his father's 1360 death.
He was succeeded the same year by Mansa Maghan's son Mari Diata II.
Tesfaun Kassa.
Maghan I
Maghan I was a mansa of the Mali Empire, following his father Kankan Musa
I's death in 1337.
Aside from legendary founder Sundiata, Kankan Musa I is generally regarded as the most successful of the Malian emperors, and Maghan inherited the empire at the height of its glory.
He reigned for only four years before being succeeded by his uncle Suleyman in 1341.
Maghan II
Maghan II was mansa of the Mali Empire from 1387 to 1389.
He was the son of Mansa Mari Diata II and the brother of Mansa Musa II.
Tunisian historian Ibn Khaldun records that Maghan II succeeded his brother to the throne in 1387, but reigned for only two years before his throne was usurped by Sandaki in 1389.

Question: Are Olof Mark and Kassa (Mansa) of the same nationality?
Answer: no