Ivy symbolizes prosperity of descendants since its branches & leaves grow and extend well.
 
In Japan, family crests representing the prosperity of descendants were especially favored. In the old days in Japan, the survival of the family bloodline was the most important thing.
 
The Todo family’s ivy has a shorter leaf when compared to No. 45.
 

 

Castle's name that stamp this family crest

・Tsu castle（Mie）
・Iga-ueno castle（Mie）
・Imabari castle（Ehime）