This needs to explain the background. This poem is Du Fu's To Brother Lu Qiu, a monk in the middle of Shu. The ancestors of the monks in Luqiuli were Lu Qiujun, a great scholar in the Wu Zetian period. Du Fu's grandfather was Du Fu, and both Lu Qiu were appointed by the court in the same year. Therefore, Du Fu's writing this poem to a monk in Qiu Yan is equivalent to writing a poem to a family friend.
My ancestor: Du Shenyan, Du Fu's grandfather, a famous poet in the period of Wu Zetian.
Guangu: the most ancient and modern.
In the same year, Lord's favor means that all the people in Luoqiu were appointed by the court in the same year as Du.
So the meaning of these two poems is: chinese odyssey, the literary talent of my ancestor, was highly valued by the court in the same year as your ancestor.