The reasons are somewhat different. Caesar did not want to accept the title “river, so as not to offend the senators and ordinary people of Rome beyond measure (the legionaries would be pleased with the triumph of their leader). Cromwell was afraid of offending the soldiers of the Republican army, reviving the royal title “king” that he hated.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.