Theophylact of Ohrid

And it was not wars alone, but also other God-sent punishments — famine and earthquakes — which clearly showed the Jews that God Himself was waging war against them. Yet all this was only "the beginning of sorrows," that is, of the calamities that awaited them.

Commentary on Mark ↗

Gregory the Dialogist

The final tribulation is preceded by many tribulations, and through the frequent evils that come before, the perpetual evils that will follow are indicated. And therefore after wars and seditions the end does not come immediately, because many evils must run before, so that they may be able to announce evil without end. …

Forty Gospel Homilies, Homily 35 ↗

Bede

Nation will rise against nation, and kingdom against kingdom, and there will be earthquakes in various places, and pestilences and famines. These are the beginnings of sorrows. In the Gospel of Luke, it is written: And there will be great earthquakes in various places, and pestilences and famines (Luke 21). It is known that these things happened literally before the last and most bitter pains, by which the entire province was devastated, or rather erased, during the time of the Jewish sedition. …

On the Gospel of Mark ↗