Well, in the 'The Sword of Tipu Sultan' novel, the theme of historical significance is likely to be prominent. Tipu Sultan's actions and his sword had a major impact on the course of history in the region. Another possible theme is the idea of legacy. His sword, as a symbol, would have been part of the legacy he left behind. Additionally, themes of loyalty and patriotism could be explored. His followers were loyal to him and his cause, and his fight against invaders could be seen as an act of patriotism. The novel might show how all these aspects were intertwined with the presence of his sword in different historical events.
One main theme could be heroism. Tipu Sultan was seen as a hero by many, and his sword could symbolize his heroic deeds. Another theme might be resistance against foreign rule, as he fought against the colonial powers.