'Ruler' in the Bible

And behold, a man came, whose name was Jairus, and he was a ruler of the synagogue, and falling at the feet of Jesus besought him to come to his house,

While he was yet speaking, comes some one from the ruler of the synagogue, saying to him, Thy daughter is dead; do not trouble the teacher.

But the ruler of the synagogue, indignant because Jesus healed on the sabbath, answering said to the crowd, There are six days in which people ought to work; in these therefore come and be healed, and not on the sabbath day.

And a certain ruler asked him saying, Good teacher, having done what, shall I inherit eternal life?