Some suggest this was due to Celtic influence, while others suggest it was a Germanic idea, although it is claimed that both Germanic and Celtic-speaking peoples commemorated the dead at the beginning of winter. They may have seen it as the most fitting time to do so, as it is a time of ‘dying’ in nature. It is also suggested the change was made on the “practical grounds that Rome in summer could not accommodate the great number of pilgrims who flocked to it”, and perhaps because of public health concerns over Roman Fever, which claimed a number of lives during Rome’s sultry summers.