Answer
Ivan the Terrible, the answer to the question, overshadowed Feodor during his early years. Ivan was Feodor's father and a formidable ruler known for his iron-fisted rule. Feodor, who later succeeded Ivan as the Tsar of Russia, was relatively young and inexperienced when he assumed the throne. Ivan's strong presence and influence loomed large, casting a shadow over Feodor's early reign and shaping the political landscape of that time.