Describing historical figures

Ada Lovelace (1815-1852) was born Augusta Ada Byron, the only legitimate child of Annabella Milbanke and the poet Lord Byron. Her mother, Lady Byron, had mathematical training (Byron called her his 'Princess of Parallelograms') and insisted that Ada, who was tutored privately, study mathematics too - an unusual education for a woman.

Ada met Charles Babbage at a party in 1833 when she was seventeen and was entranced when Babbage demonstrated the small working section of the Analytical Engine to her. She intermitted her mathematical studies for marriage and motherhood but resumed when domestic duties allowed.

In 1843 she published a translation from the French of an article on the Analytical Engine by an Italian engineer, Luigi Menabrea, to which Ada added extensive notes of her own. The Notes included the first published description of a stepwise sequence of operations for solving certain mathematical problems and Ada is often referred to as 'the first programmer'. The collaboration with Babbage was close and biographers debate the extent and originality of Ada's contribution.

Perhaps more importantly, the article contained statements by Ada that from a modern perspective are visionary. She speculated that the Engine 'might act upon other things besides number... the Engine might compose elaborate and scientific pieces of music of any degree of complexity or extent'.

The idea of a machine that could manipulate symbols in accordance with rules and that number could represent entities other than quantity mark the fundamental transition from calculation to computation. Ada was the first to explicitly articulate this notion and in this she appears to have seen further than Babbage.

She has been referred to as 'prophet of the computer age'. Certainly she was the first to express the potential for computers outside mathematics. In this the tribute is well-founded.

Mansa Musa was the ruler of the kingdom of Mali from 1312 C.E. to 1337 C.E. During his reign, Mali was one of the richest kingdoms of Africa, and Mansa Musa was among the richest individuals in the world.

The ancient kingdom of Mali spread across parts of modern-day Mali, Senegal, the Gambia, Guinea, Niger, Nigeria, Chad, Mauritania, and Burkina Faso. Mansa Musa developed cities like Timbuktu and Gao into important cultural centers. He also brought architects from the Middle East and across Africa to design new buildings for his cities. Mansa Musa turned the kingdom of Mali into a sophisticated center of learning in the Islamic world.

Mansa Musa came to power in 1312 C.E., after the previous king, Abu Bakr II, disappeared at sea. Mansa Abu Bakr II had departed on a large fleet of ships to explore the Atlantic Ocean, and never returned. Mansa Musa inherited a kingdom that was already wealthy, but his work in expanding trade made Mali the wealthiest kingdom in Africa. His riches came from mining significant salt and gold deposits in the Mali kingdom. Elephant ivory was another major source of wealth.

When Mansa Musa went on a pilgrimage (hajj) to Mecca in 1324 C.E., his journey through Egypt caused quite a stir. The kingdom of Mali was relatively unknown outside of West Africa until this event. Arab writers from the time said that he travelled with an entourage of tens of thousands of people and dozens of camels, each carrying 136 kilograms (300 pounds) of gold. While in Cairo, Mansa Musa met with the Sultan of Egypt, and his caravan spent and gave away so much gold that the overall value of gold decreased in Egypt for the next 12 years.

After his return from Mecca, Mansa Musa began to revitalize cities in his kingdom. He built mosques and large public buildings in cities like Gao and, most famously, Timbuktu. Timbuktu became a major Islamic university center during the 14th century due to Mansa Musa’s developments. Mansa Musa brought architects and scholars from across the Islamic world into his kingdom, and the reputation of the Mali kingdom grew. The kingdom of Mali reached its greatest extent around the same time, a bustling, wealthy kingdom thanks to Mansa Musa’s expansion and administration.

Mansa Musa died in 1337 and was succeeded by his sons. His skillful administration left his empire well-off at the time of his death, but eventually, the empire fell apart. Well after his death, Mansa Musa remained engrained in the imagination of the world as a symbol of fabulous wealth. However, his riches are only one part of his legacy, and he is also remembered for his Islamic faith, promotion of scholarship, and patronage of culture in Mali.