Orhan vs Raja Raja Chola I

Orhan captured the city of Bursa from the Byzantine Empire after a prolonged siege. He made Bursa the first Ottoman capital, establishing it as a political and economic center that would serve as the base for further expansion into Europe.

Orhan defeated a Byzantine army led by Emperor Andronikos III at Pelekanon near Nicomedia. This victory secured Ottoman control over northwestern Anatolia and forced the Byzantines to abandon attempts to reclaim lost territory.

Orhan captured the Byzantine city of Nicomedia (modern

Orhan married Theodora, the daughter of Byzantine emperor John VI Kantakouzenos, as part of a political alliance. This marriage strengthened Ottoman-Byzantine relations and gave the Ottomans a foothold in European affairs.

Orhan is traditionally credited with creating the Janissary corps, an elite infantry unit composed of Christian boys taken through the devshirme system. This force became the backbone of the Ottoman military, though its exact origins are debated.

Raja Raja Chola I ascended the throne of the Chola Empire, succeeding his father Parantaka II. He inherited a kingdom in the Tamil region and began a series of military campaigns that would transform the Chola state into a major power.

Raja Raja Chola I defeated the Chera king Bhaskara Ravi Varman and annexed the Chera territories in present-day Kerala. This conquest gave the Cholas control over the Malabar Coast and its spice trade.

Raja Raja Chola I conducted a comprehensive land survey and reorganized the revenue system. He standardized tax collection and recorded land holdings in inscriptions, which improved administrative efficiency and funded his military and building projects.

Raja Raja Chola I launched a naval expedition against the Srivijaya Empire in Southeast Asia, targeting the Strait of Malacca. The campaign disrupted Srivijaya's trade monopoly and established Chola influence in the region, though full conquest was not achieved.

Raja Raja Chola I commissioned the construction of the Brihadeeswarar Temple in Thanjavur, dedicated to Shiva. The temple, built with granite, features a 66-meter vimana and is a masterpiece of Dravidian architecture, later designated a UNESCO World Heritage site.