How many years from 1998 to 2015?

What is franincence? Who decided whom a noble woman was going to marry? What were the crusades and why were they fought? Who was the roman empire 79AD? What is the two main periods in roman history? Why do civilization need laws? What did the Romans gain by invading Belgium? What were some of the effects of the crusades in Europe? The goal of the crusade was? Something worn over the face? What does the name vanwinkle mean? Read the list of procedures for incorporating research materials into one's own writing then choose the number for each that puts them into their logical chronological order.? What were the causes for crusades? What day and month and year did the western movement stard and end? What is the original origin of the word what? How long has slavery existed for? What was Istanbul called before it was renamed in 1930? What are galleys? How did Houdini walk through walls? How did First Nations get around?