Which civilizations have the Caballeros card?

Germans, Spanish, Italians and Mexicans.

What does Caballeros do in AoE3?

Gives: Caballeros; Ships 1 Spanish Treasure Chest. The game says: "Lancer units do increased damage to infantry and can strike from additional range."

Home City card

Caballeros

Caballeros (tech ID DEHCREVMXCaballeros) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 4 civilizations, sent from the Discovery Age and Industrial Age. Effect: Gives: Caballeros; Ships 1 Spanish Treasure Chest.

Quick answers (3)

Which civilizations have the Caballeros card?: Germans, Spanish, Italians and Mexicans.
What does Caballeros do in AoE3?: Gives: Caballeros; Ships 1 Spanish Treasure Chest. The game says: "Lancer units do increased damage to infantry and can strike from additional range."
What is the tech ID of Caballeros?: DEHCREVMXCaballeros.

Lancer units do increased damage to infantry and can strike from additional range.

What it does

Gives: Caballeros
Ships 1 Spanish Treasure Chest(unit)

Cost: 1
Sent from: IIV
Times it can be sent: 1
Game ID: DEHCREVMXCaballeros

In these decks

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).