Why do you think magellan had problems with the crews of his ships?

Ferdinand began to encounter some problems, word had got out that Ferdinand was Portuguese of origin. Several of the Spanish captains didn’t trust Ferdinand and were said to have plotted to murder Ferdinand. The news spread quickly and chaos began to breakout among the crew. Some ruthless members of the crew attempted to murder Ferdinand, despite failing these cold-hearted men were executed.  

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answer; can each be concretely realized in different ways;