Final answer:
Zeno of Citium, the founder of Stoicism, reacted to losing all his wealth in a shipwreck with stoic indifference and calmness, emphasizing the insignificance of material possessions.
Step-by-step explanation:
Zeno of Citium, the founder of the philosophy school of Stoicism, experienced a significant loss of wealth when he was shipwrecked. According to historical accounts, Zeno reacted to this loss with remarkable indifference and calmness, demonstrating his adherence to the Stoic principles he taught. He viewed the loss of material possessions as inconsequential and remained focused on his philosophical pursuits, valuing virtue and inner tranquility above worldly possessions.