Final answer:
Nellie Quander was the only woman to hold the honorary title of Basileus (president) at the 1926 Boule, marking a significant moment in women's leadership history, alongside the achievements of Frances Perkins and Mary McLeod Bethune.
Step-by-step explanation:
The honorary title of Basileus (president) at the 1926 Boule, a distinction that no other woman has held, was bestowed upon Nellie Quander. This historical accolade is a testament to the active participation and influence of women not only in organizational leadership but also in broader societal leadership roles during the early twentieth century, aligning with the accomplishments of other pioneering women such as Frances Perkins and Mary McLeod Bethune. Perkins is noted for her trailblazing work as a feminist and governmental leader, while Bethune is celebrated for her significant impact as an advisor to President Roosevelt and as the founder of a college.