The Yechoniah Gate was the most western gate of the four northern gates of the Court. It was called thusly because King Yechoniah exited through this gate, en route to the Babylonian exile at the end of the First Temple period. This gate was also called the Gate of the Spark. Some say that the origin of this name is because above this gate, there was a loft where a small fire was kept burning, from which the woodpile could be lit, in case its fire had been extinguished. This loft was one of the three places guarded by the priests. (Source : Midot 2:6). 
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