The late 15th-century Iberian Peninsula was a tapestry of intertwined religious and cultural entities, which significantly influenced its socio-economic landscape. Let's delve deeper into the nuanced dynamics of this era.

Societal Interactions Among Different Religious and Cultural Groups

Coexistence and Tension:

• Convivencia: Spain's illustrious past showcased a unique coexistence among Muslims, Jews, and Christians. This harmonious living, termed "Convivencia", paints an image of mutual tolerance, particularly during the early epochs of Muslim governance.
• Shifts in Relations: As the sands of time shifted to the late 15th century, so did societal undercurrents. The ascension of Catholic monarchs, driven by the vision of a homogenous Christian Spain, exacerbated religious tensions.
• Areas of Interaction: Nonetheless, realms of cooperation existed. Trade and intellectual pursuits often saw members of different religious backgrounds joining hands. While this fostered cultural assimilation, it occasionally also courted resentment.

Urban Life:

• Metropolises like Granada and Toledo metamorphosed into cultural crucibles. Vibrant souks (markets), public baths, and educational institutions hosted a diverse clientele.
• The formation of distinct Jewish quarters or Juderías and a growing segregation of the Muslim populace indicated simmering divisions.

Economic Conditions

Trade

Key Trade Centres:

• Urban centres such as Seville, Valencia, and Barcelona burgeoned into critical trading nexuses, bridging the gap between the Mediterranean and the frosty climes of Northern Europe.
• Commodities: A medley of commodities, ranging from Granada's silky textures, Málaga's intricate ceramics, to an assortment of agricultural produce, were highly sought after in European markets.

International Relations:

• North African and Mediterranean Ties: Religious disparities notwithstanding, an animated trade circuit with North African and Mediterranean territories persisted.
• The growing Christian hegemony did not staunch the flow of trade with Islamic lands. Often, pragmatic economic imperatives trumped religious chasms.

Agriculture

Crops and Techniques:

• A vestige of Muslim reign was their sophisticated agricultural methodologies, especially advanced irrigation systems. These innovations enabled the successful cultivation of diverse crops, including sugarcane, rice, and zesty citrus fruits.
• Land Redistribution: The steady recapture of Muslim bastions by Christian forces heralded an extensive land redistribution. These new landholding patterns often favoured Christian aristocracy and significantly influenced agrarian dynamics.

Vineyards and Olives:

• While vineyards and olive orchards had made their presence felt during the Muslim epoch, their expanse widened considerably during this period, feeding the growing demand in European markets.

Impact of Taxation on Different Social Strata

Special Levies:

• Non-Christian demographics, especially Jews and Muslims, found themselves burdened by the jizya (a tax levied on non-Muslims) or comparable taxes.
• The imposition of these financial burdens oftentimes sapped the economic vitality of these communities, leading to simmering resentments.

Regular Taxes:

• Tithes to the Church: A substantial portion of one's agricultural yield was expected to be offered as tithes to the church, a mandate which occasionally overburdened the peasantry.
• Tributes to Nobility: The intricate web of feudalism demanded that peasants also part with a part of their produce as tributes to their Christian overlords, widening the economic chasm.

Intercultural Exchange and Its Influence

Architectural Transitions:

• A delightful confluence of Muslim and Christian architectural ethos gave birth to distinct styles, notably the Mudejar style. This architectural symphony is a testament to Iberia's rich cultural tapestry.

Learning and Knowledge Transfer:

• The annals of history fondly remember Muslim Spain as a beacon of enlightenment, especially in disciplines like astronomy, maths, and medicine. The waning years of the 15th century witnessed a seminal transfer of this knowledge pool to Christian Europe, orchestrated often by erudite Jewish scholars and translators.
• Seminal institutions, like the Toledo School of Translators, became the lynchpin in this grand knowledge dissemination exercise.

Craftsmanship:

• Craftsmanship in Spain bore the indelible mark of its diverse inhabitants. Pottery, textile, and metalwork techniques were often a blend of various traditions, elevating Spanish artisanal goods to a coveted status in European markets.

Culinary Exchange:

• Spain's gastronomic landscape was vastly enriched by its Muslim rulers. Ingredients such as rice, almonds, and saffron, which had been introduced during their reign, had, by the late 15th century, seamlessly woven into the culinary fabric of Spain.

Drawing a curtain on this era, it's evident that the 15th-century Iberian socio-economic milieu was a product of intricate religious, cultural, and economic tapestries. While the drumbeats of religious discord grew louder, the robust edifice of economic collaboration and cultural exchange, built over centuries of Muslim stewardship, largely stood its ground.