Fetching details from the dictionary...

wagon; yamatogoto; six-stringed native Japanese zither
my spouse
吾嬬のことを想っている。
I'm thinking of my wife.
吾嬬の地に帰りたいなあ。
I wish I could return to the eastern land.
吾嬬への思いを歌に詠んで残したそうだ。
It's said they composed a poem about their wife and left it behind.