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The contemporary South Indian ruler of Harshavardhana was Pulakeshin II, who was the second ruler of the Chalukya dynasty. Option 1, Krishnadevaraya, was a ruler of the Vijayanagara Empire, but he lived several centuries after Harshavardhana. Option 3, Mayuravarma, and option 4, Chikkadevaraja Wodeyar, are not relevant as they were rulers of different dynasties and time periods. Pulakeshin II had a significant impact on South Indian history and is particularly known for his military victories against Harshavardhana. He successfully defended his kingdom from Harshavardhana`s attempts to expand his empire and even went on to defeat Harshavardhana in battle. Therefore, Harshavardhana and Pulakeshin II were contemporaries, making option 2 the correct answer.