Want to get petty? My country still holds a grudge because we married a princess of ours with our neighbouring country king, while they sent one theirs to marry with our king (so, for all practical purpouses, a hostage exchange).

The only problem with it, was that our princess was gourgeous, while the princess sent here was ugly as stormy night.

To this day, we still have a coloquial expression of despize where we literally say we gave sardine in return of hake.

My country has sardine as a high value fish, since ever.