"And Ya'akov was left alone, and a man wrestled with him until the break of dawn. When he saw that he could not prevail against him, he touched the socket of his hip, and the socket of Ya'akov's hip became dislocated as he wrestled with him. And he (the angel) said, 'Let me go, for dawn is breaking,' but he (Ya'akov) said, 'I will not let you go unless you have blessed me.' So he said to him, 'What is your name?' and he said, 'Ya'akov.' And he said, 'Your name shall be called no more Ya'akov, but Yisra'el; for you have contended with G-d and with men, and have prevailed'" (Bereisheet 32:25-29). It was the eve of Nissan 15.
Moshe Heinemann: A matzah that is completely white on both sides should not be used, since it may not have been thoroughly baked. Matzah meal should be slightly brown in color, which indicates a better bake on the matzos that were used for the matzah meal.
WIKIPEDIA: According to the Bible, Galilee was named by the Israelites and was the tribal region of Naphthali and Dan, at times overlapping the Tribe of Asher's land.
